Working Zoom

public/scripts/chart_loader.js

@@ -77,29 +77,29 @@ class ChartLoader {
     }
 
     getEffectObjects() {
-        
+
     }
 
-    addListener(newChart) {
+    addListener(chart) {
         //Click
         document.addEventListener('mousemove', (e) => {
             const pos = {
                 x: e.clientX,
                 y: e.clientY
             }
-            
+
             let shapeIndex = this.selectedShapeIndex
             if (shapeIndex === null)
                 shapeIndex = this.getShapeIndex(this.detectionCanvas, pos)
 
             if (shapeIndex !== null) {
-                let obj = newChart.objects[shapeIndex]
+                let obj = chart.objects[shapeIndex]
 
                 // Effect
                 let effectCtx = this.effectCanvas.getContext("2d")
                 effectCtx.clearRect(0, 0, effectCanvas.width, effectCanvas.height)
                 this.effectCanvas.style.opacity = 1
-                newChart.drawEffect(effectCtx, [obj])
+                chart.drawEffect(effectCtx, [obj])
 
                 this.dataDiv.style.display = "block"
 
@@ -115,7 +115,7 @@ class ChartLoader {
                     this.dataDiv.style.top = pos.y - this.dataDiv.clientHeight + "px"
 
                 this.dataDiv.style.display = "block"
-                let name = newChart.data[obj.colId.toString()].col_name
+                let name = chart.data[obj.colId.toString()].col_name
                 this.dataDiv.innerHTML = "<b>" + name + "</b><br><p>" + obj.value + "</p>"
             }
             else {
@@ -145,18 +145,30 @@ class ChartLoader {
             else
                 this.selectedShapeIndex = this.clickedShapeIndex
 
-            console.log(this.clickedShapeIndex + " " +
-                        this.getShapeIndex(this.detectionCanvas, pos) + " " +
-                        this.shapeSelected)
+            /*console.log(this.clickedShapeIndex + " " +
+                this.getShapeIndex(this.detectionCanvas, pos) + " " +
+                this.shapeSelected)*/
         })
 
         window.addEventListener("resize", e => {
-            //newChart.updateLegend(graphSettings.displayLegend, data)
-            newChart.resizeCanvas(this.parent, this.legend.offsetHeight)
-            newChart.draw()
+            //chart.updateLegend(chartSettings.displayLegend, data)
+            chart.resizeCanvas(this.parent, this.legend.offsetHeight)
+            chart.draw()
 
             this.addInteractivity()
         })
+
+        if (chart.settings.horizontalZoom || chart.settings.verticalZoom)
+            window.addEventListener("wheel", e => {
+                e.stopImmediatePropagation()
+                e.stopPropagation()
+                e.preventDefault()
+
+                chart.zoom.recalculate(e, true, true)
+                chart.updateBounds()
+                chart.draw()
+                this.addInteractivity()
+            }, { passive: false })
     }
 
     async addInteractivity() {
@@ -171,40 +183,41 @@ class ChartLoader {
         }, 0)
     }
 
-    drawChart(graphSettings, data) {
+    drawChart(chartSettings, data) {
+        let zoomManager = new ZoomManager(chartSettings.horizontalZoom, chartSettings.verticalZoom)
 
         //Choose the correct graph
-        switch (graphSettings.type) {
+        switch (chartSettings.type) {
             case "point":
-                this.chart = new PointChart(this.canvas, data, graphSettings)
+                this.chart = new PointChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "line":
-                this.chart = new LineChart(this.canvas, data, graphSettings)
+                this.chart = new LineChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "smoothline":
-                this.chart = new SmoothLineChart(this.canvas, data, graphSettings)
+                this.chart = new SmoothLineChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "pie":
-                this.chart = new PieChart(this.canvas, data, graphSettings)
+                this.chart = new PieChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "donut":
-                this.chart = new DonutChart(this.canvas, data, graphSettings)
+                this.chart = new DonutChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "bar":
-                this.chart = new BarChart(this.canvas, data, graphSettings)
+                this.chart = new BarChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "area":
-                this.chart = new AreaChart(this.canvas, data, graphSettings)
+                this.chart = new AreaChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "smootharea":
-                this.chart = new SmoothAreaChart(this.canvas, data, graphSettings)
+                this.chart = new SmoothAreaChart(this.canvas, data, chartSettings, zoomManager)
                 break
             case "stacked":
-                this.chart = new StackedChart(this.canvas, data, graphSettings)
+                this.chart = new StackedChart(this.canvas, data, chartSettings, zoomManager)
                 break
         }
 
-        setTimeout(this.chart.updateLegend(graphSettings.displayLegend, this.legend, this), 0)
+        setTimeout(this.chart.updateLegend(chartSettings.displayLegend, this.legend, this), 0)
         this.chart.resizeCanvas(this.parent, this.legend.offsetHeight)
 
         this.chart.draw()

public/scripts/charts/area_chart.js

@@ -8,9 +8,11 @@ class AreaChart extends PointChart {
     * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
     * @param {Array<Object>} data - The data to visualize on the chart
     * @param {Object} settings - The settings for the chart
-    */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    * @param {ZoomManager} zoom - The zoom manager for the chart.
+     */
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**
@@ -35,17 +37,16 @@ class AreaChart extends PointChart {
                 if (categ.values[i] === null) continue
 
                 // Calculate the x and y coordinates for the current value
-                let x = this.bounds.left + this.bounds.width / (this.dataLen - 1) * i
-                let y = this.bounds.xAxis - categ.values[i] / this.extreme * this.scale
-                xmax = x
+                let pos = this.getPointPos(i, categ.values[i])
+                xmax = pos.x
 
-                this.ctx.lineTo(x, y)
+                this.ctx.lineTo(pos.x, pos.y)
             }
             this.ctx.stroke()
 
             // Complete the area by drawing lines to the x-axis and back to the starting point
-            this.ctx.lineTo(xmax, this.bounds.xAxis)
-            this.ctx.lineTo(this.bounds.left, this.bounds.xAxis)
+            this.ctx.lineTo(xmax, this.zoomBounds.xAxis)
+            this.ctx.lineTo(this.zoomBounds.left, this.zoomBounds.xAxis)
             this.ctx.globalAlpha = 0.5
             this.ctx.fillStyle = categ.color
             this.ctx.closePath()

public/scripts/charts/bar_chart.js

@@ -8,9 +8,11 @@ class BarChart extends Chart {
     * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
     * @param {Array<Object>} data - The data to visualize on the chart
     * @param {Object} settings - The settings for the chart
-    */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    * @param {ZoomManager} zoom - The zoom manager for the chart.
+     */
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**
@@ -18,6 +20,7 @@ class BarChart extends Chart {
      */
     draw() {
         // Calculate the number of bars/categories in the chart
+        this.clear()
         let barCount = this.data.length
 
         // Draw the axis without displaying axis values
@@ -40,11 +43,11 @@ class BarChart extends Chart {
                 // Value of the bar
                 let value = categ.values[i]
                 // The left position of the bar in section
-                let left = this.bounds.left + (size * (i + 0.15) + (innerSize * num / barCount))
+                let left = this.zoomBounds.left + (size * (i + 0.15) + (innerSize * num / barCount)) * this.zoom.scaleX
                 // The height of the bar relative to the chart scale
-                let bar_height = value / this.extreme * this.scale
+                let bar_height = value / this.extreme * this.scale * this.zoom.scaleY
                 // The top position of the bar
-                let top = this.bounds.xAxis - categ.values[i] / this.extreme * this.scale
+                let top = this.zoomBounds.xAxis - categ.values[i] / this.extreme * this.scale * this.zoom.scaleY
 
                 // Draw x-axis labels
                 // Only for first category to avoid repeated drawings
@@ -55,18 +58,28 @@ class BarChart extends Chart {
                     this.ctx.font = "16px Arial"
                     this.ctx.fillStyle = "black"
                     this.ctx.textAlign = "center"
-                    this.ctx.fillText(text, this.bounds.width / this.dataLen * i + size / 2 + this.bounds.left, this.bounds.bottom + 15)
+                    this.ctx.fillText(text, this.zoomBounds.width / this.dataLen * i + size / 2 + this.zoomBounds.left, this.bounds.bottom + 15)
                     this.ctx.stroke()
                     this.ctx.closePath()
                 }
 
-                // Set the fill color and draw the rectangle for the current bar
+                // Increment the count of bars
                 num++
-                this.ctx.fillStyle = categ.color
-                this.ctx.lineWidth = 0
-                let new_object = new Rectangle(this.ctx, value, colId, left, top, bar_width, bar_height)
-                new_object.draw()
-                this.objects.push(new_object)
+
+                // Create a new Rectangle object representing the current bar
+                let newObject = new Rectangle(this.ctx, value, colId, left, top, bar_width, bar_height)
+                // Add the new Rectangle object to the list of objects
+                this.objects.push(newObject)
+
+                // Check if the center of the new bar is within the bounds
+                if (this.isInBounds(newObject.getCenter())) {
+                    // Set the fill color to the category color
+                    this.ctx.fillStyle = categ.color
+                    // Set the line width to 0 to prevent drawing the border
+                    this.ctx.lineWidth = 0
+                    // Draw the filled rectangle representing the current bar
+                    newObject.draw()
+                }
             })
         }
     }

public/scripts/charts/chart.js

@@ -44,7 +44,13 @@ function getSmallest(data) {
     return smallest
 }
 
-// Lighten or darken a hex color
+/**
+ * Lighten or darken a hex color.
+ * 
+ * @param {string} color - The hex color code.
+ * @param {number} amount - The amount to lighten or darken the color by.
+ * @returns {string} The adjusted hex color.
+ */
 function adjustColor(color, amount) {
     return '#' + color.replace(/^#/, '').replace(/../g, color => ('0' + Math.min(255, Math.max(0, parseInt(color, 16) + amount)).toString(16)).substr(-2))
 }
@@ -59,11 +65,13 @@ class Chart {
      * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
      * @param {Array<Object>} data - The data to visualize on the chart
      * @param {Object} settings - The settings for the chart
+     * @param {ZoomManager} zoom - The zoom manager for the chart.
      */
-    constructor(canvas, data, settings) {
+    constructor(canvas, data, settings, zoom) {
         this.data = data // The data to visualize on the chart
         this.settings = settings // The settings for the chart
         this.canvas = canvas // The canvas element to draw the chart on
+        this.zoom = zoom // The zoom manager for the chart.
         this.ctx = canvas.getContext("2d") // The 2D drawing context for the canvas
 
         // Calculate the largest and smallest values from the data
@@ -74,7 +82,7 @@ class Chart {
         this.dataLen = Math.max( // get max index
             ...data.map(category => // from each category
                 Object.keys(category.values)[Object.keys(category.values).length - 1] // gets last(largest) key
-                )) + 1 // indexes start at zero, so the length is +1
+            )) + 1 // indexes start at zero, so the length is +1
 
         // Update the bounds of the chart based on the canvas size and margins
         this.updateBounds()
@@ -93,6 +101,8 @@ class Chart {
         this.scale = this.bounds.height
             - (this.largest >= 0 ? (this.bounds.bottom - this.bounds.xAxis) : 0)
         this.extreme = this.largest <= 0 ? Math.abs(this.smallest) : Math.abs(this.largest)
+
+        this.zoomBounds = this.getZoomBounds()
     }
 
     /**
@@ -128,10 +138,51 @@ class Chart {
             // between the two points on the graph area.
             result.xAxis = result.bottom
                 - result.height / ((Math.abs(this.largest)) + Math.abs(this.smallest)) * Math.abs(this.smallest)
+        
+        return result
+    }
+
+    /**
+     * Retrieves the zoomed bounds of the chart.
+     * @returns {Object} An object containing zoomed bounds information.
+     */
+    getZoomBounds() {
+        let result = {}
+
+        // Get screen coordinates of the top-left corner of the bounds
+        let pos = this.zoom.worldToScreen(this.bounds.left, this.bounds.top)
+        result.left = pos.x
+        result.top = pos.y
+
+        // Get screen coordinates of the bottom-right corner of the bounds
+        pos = this.zoom.worldToScreen(this.bounds.right, this.bounds.bottom)
+        result.right = pos.x
+        result.bottom = pos.y
+
+        // Calculate width and height of the zoomed bounds
+        result.width = this.bounds.width * this.zoom.scaleX
+        result.height = this.bounds.height * this.zoom.scaleY
+
+        // Get the screen coordinate of the x-axis
+        result.xAxis = this.zoom.worldToScreen(null, this.bounds.xAxis).y
 
         return result
     }
 
+    /**
+     * Checks if a given position is within the bounds.
+     *
+     * @param {Object} pos - The position to check with x and y coordinates.
+     * @returns {boolean} Returns true if the position is within the bounds, false otherwise.
+     */
+    isInBounds(pos) {
+        return !(
+            pos.x < this.bounds.left ||
+            pos.x > this.bounds.right ||
+            pos.y < this.bounds.top ||
+            pos.y > this.bounds.bottom)
+    }
+
     /**
      * Draw the title on the canvas.
      */
@@ -252,13 +303,16 @@ class Chart {
         ctx.fill()
 
         this.objects.forEach(object => {
-            // Encode shape index into color
-            let color = "#" + object.index.toString(16).padStart(6, '0')
-            ctx.fillStyle = color
-            ctx.strokeStyle = color
-
-            // Draw the shape
-            object.draw(ctx)
+            // Only draw objects on screen
+            if (this.isInBounds(object.getCenter())) {
+                // Encode shape index into color
+                let color = "#" + object.index.toString(16).padStart(6, '0')
+                ctx.fillStyle = color
+                ctx.strokeStyle = color
+    
+                // Draw the shape
+                object.draw(ctx)
+            }
         })
     }
 
@@ -272,8 +326,6 @@ class Chart {
         // Clear the entire canvas to prepare for redrawing
         ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
         ctx.fill()
-        
-        ctx.scale(2, 2)
 
         ctx.shadowBlur = 15
         objects.forEach(object => {
@@ -293,8 +345,6 @@ class Chart {
             // Stroke to draw the border
             ctx.stroke()
         })
-
-        ctx.scale(0.5, 0.5)
     }
 
     /**
@@ -325,6 +375,11 @@ class Chart {
         // Draw the title if enabled
         if (this.settings.displayTitle)
             this.drawTitle()
+
+        this.ctx.beginPath()
+        this.ctx.rect(this.bounds.left, this.bounds.top, this.bounds.width, this.bounds.height)
+        this.ctx.clip()
+        this.ctx.closePath()
     }
 
     /**
@@ -341,18 +396,23 @@ class Chart {
             this.ctx.lineWidth = 1
 
             // Calculate the Y-position for the tick
-            let yPos = Math.round(this.bounds.xAxis - i * this.scale / this.extreme)
+            let y = this.bounds.xAxis - i * this.scale / this.extreme
+            y = this.zoom.worldToScreen(null, y).y
+
+            // Skip text and lines if out of bounds
+            if (y < this.bounds.top || y > this.bounds.bottom)
+                continue
 
             // Draw support lines if enabled
             if (this.settings.displaySupportLines) {
-                this.ctx.moveTo(this.bounds.left, yPos)
-                this.ctx.lineTo(this.bounds.right, yPos)
+                this.ctx.moveTo(this.bounds.left, y)
+                this.ctx.lineTo(this.bounds.right, y)
             }
 
             // Set text style and alignment for the Y-axis values
             this.ctx.fillStyle = "black"
             this.ctx.textAlign = "end"
-            this.ctx.fillText(i, this.bounds.left - 3, yPos)
+            this.ctx.fillText(i, this.bounds.left - 3, y)
 
             // Draw the tick
             this.ctx.stroke()
@@ -374,13 +434,18 @@ class Chart {
             // Loop through the data to draw X-axis ticks and labels
             for (let i = 0; i < this.dataLen; i++) {
                 // Calculate the X-position for the tick
-                let x = this.bounds.left + this.bounds.width / (this.dataLen - 1) * i
+                let x = this.zoomBounds.left + this.zoomBounds.width / (this.dataLen - 1) * i
+                let y = this.bounds.bottom + 18
+
+                // Skip text if out of bounds
+                if (x < this.bounds.left || x > this.bounds.right)
+                    continue
 
                 // Set the text for the X-axis label
                 let text = (i + 1).toString()
 
                 // Draw the X-axis label
-                this.ctx.fillText(text, x, this.bounds.bottom + 18)
+                this.ctx.fillText(text, x, y)
             }
             this.ctx.closePath()
         }
@@ -401,8 +466,14 @@ class Chart {
         this.ctx.lineTo(this.bounds.left, this.bounds.bottom)
 
         // Draw the horizontal X-axis line
-        this.ctx.moveTo(this.bounds.left, this.bounds.xAxis)
-        this.ctx.lineTo(this.bounds.right, this.bounds.xAxis)
+        let y = this.zoomBounds.xAxis
+        if (y < this.bounds.top)
+            y = this.bounds.top
+        if (y > this.bounds.bottom)
+            y = this.bounds.bottom
+
+        this.ctx.moveTo(this.bounds.left, y)
+        this.ctx.lineTo(this.bounds.right, y)
 
         this.ctx.stroke()
     }

public/scripts/charts/donut_chart.js

@@ -8,9 +8,11 @@ class DonutChart extends Chart {
     * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
     * @param {Array<Object>} data - The data to visualize on the chart
     * @param {Object} settings - The settings for the chart
-    */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    * @param {ZoomManager} zoom - The zoom manager for the chart.
+     */
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**

public/scripts/charts/line_chart.js

@@ -8,9 +8,11 @@ class LineChart extends PointChart {
     * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
     * @param {Array<Object>} data - The data to visualize on the chart
     * @param {Object} settings - The settings for the chart
-    */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    * @param {ZoomManager} zoom - The zoom manager for the chart.
+     */
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**
@@ -33,10 +35,9 @@ class LineChart extends PointChart {
                 if (categ.values[i] === null) continue
 
                 // Calculate the x and y coordinates for the current value
-                let x = this.bounds.left + this.bounds.width / (this.dataLen - 1) * i
-                let y = this.bounds.xAxis - categ.values[i] / this.extreme * this.scale
+                let pos = this.getPointPos(i, categ.values[i])
 
-                this.ctx.lineTo(x, y)
+                this.ctx.lineTo(pos.x, pos.y)
             }
             this.ctx.stroke()
             this.ctx.closePath()

public/scripts/charts/pie_chart.js

@@ -8,9 +8,11 @@ class PieChart extends Chart {
     * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
     * @param {Array<Object>} data - The data to visualize on the chart
     * @param {Object} settings - The settings for the chart
-    */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    * @param {ZoomManager} zoom - The zoom manager for the chart.
+     */
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**

public/scripts/charts/point_chart.js

@@ -7,10 +7,18 @@ class PointChart extends Chart {
      * @param {HTMLElement} canvas - The canvas element to draw the chart on
      * @param {Array} data - The data array containing values for the chart
      * @param {Object} settings - The settings object for configuring the chart
+     * @param {ZoomManager} zoom - The zoom manager for the chart.
      */
-    constructor(canvas, data, settings) {
+    constructor(canvas, data, settings, zoom) {
         // Call the constructor of the parent class (Chart)
-        super(canvas, data, settings)
+        super(canvas, data, settings, zoom)
+    }
+
+    getPointPos(i, value) {
+        return {
+            x: Math.round(this.zoomBounds.left + this.zoomBounds.width / (this.dataLen - 1) * i),
+            y: Math.round(this.zoomBounds.xAxis - value / this.extreme * this.scale * this.zoom.scaleY)
+        }
     }
 
     /**
@@ -40,17 +48,22 @@ class PointChart extends Chart {
                 continue
             
             // Calculate the x and y coordinates for the data point
-            let x = Math.round(this.bounds.left + this.bounds.width / (this.dataLen - 1) * i)
-            let y = Math.round(this.bounds.xAxis - values[i] / this.extreme * this.scale)
+            let pos = this.getPointPos(i, values[i])
 
             // Create a new Circle object for the data point
-            let new_object = new Circle(this.ctx, values[i], name, x, y, this.settings.pointSize)
-            new_object.draw()
-            this.objects.push(new_object)
+            let shape = new Circle(this.ctx, values[i], name, pos.x, pos.y, this.settings.pointSize)
 
-            // Draw a border if enabled
-            if (this.settings.pointBorderSize > 0)
-                this.ctx.stroke()
+            // Don't draw objects outside of screen (zoom or panning)
+            if (this.isInBounds(shape.getCenter())) {
+                shape.draw(this.ctx)
+
+                // Draw a border if enabled
+                if (this.settings.pointBorderSize > 0)
+                    this.ctx.stroke()
+            }
+
+            // Add the shape
+            this.objects.push(shape)
         }
     }
 
@@ -68,6 +81,7 @@ class PointChart extends Chart {
                 console.time("1")
                 this.data.forEach((categ, colId) => {this.drawPoints(categ.values, colId, categ.color)})
                 console.timeEnd("1")
-            }, 0);
+            }, 0)
+
     }
 }

public/scripts/charts/primitives.js

@@ -65,6 +65,18 @@ class Rectangle extends Shape {
         // Fill the rectangle with the current fill style
         ctx.fill()
     }
+
+    /**
+     * Returns the center coordinates of the rectangle.
+     *
+     * @returns {Object} Object containing x and y coordinates of the center.
+     */
+    getCenter() {
+        return {
+            x: this.x + this.w / 2,
+            y: 50
+        }
+    }
 }
 
 /**
@@ -91,13 +103,25 @@ class Circle extends Shape {
      *
      * @param {CanvasRenderingContext2D} [ctx=this.ctx] - The 2D drawing context for the canvas
      */
-    draw(ctx = this.ctx) {
+    draw(ctx = this.ctx) {        
         ctx.beginPath()
         // Define the circle
         ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI)
         // Fill the circle with the current fill style
         ctx.fill()
     }
+
+    /**
+     * Returns the center coordinates of the circle.
+     *
+     * @returns {Object} Object containing x and y coordinates of the center.
+     */
+    getCenter() {
+        return {
+            x: this.x,
+            y: this.y
+        }
+    }
 }
 
 /**
@@ -138,6 +162,18 @@ class PieSlice extends Circle {
         // Fill the pie slice with the current fill style
         ctx.fill()
     }
+
+    /**
+     * Returns the center coordinates of the pie slice.
+     *
+     * @returns {Object} Object containing x and y coordinates of the center.
+     */
+    getCenter() {
+        return {
+            x: this.x,
+            y: this.y
+        }
+    }
 }
 
 /**
@@ -178,4 +214,16 @@ class DonutSlice extends PieSlice {
         // Fill the donut slice with the current fill style
         ctx.fill()
     }
+    
+    /**
+     * Returns the center coordinates of the donut slice.
+     *
+     * @returns {Object} Object containing x and y coordinates of the center.
+     */
+    getCenter() {
+        return {
+            x: this.x,
+            y: this.y
+        }
+    }
 }

public/scripts/charts/smooth_area_chart.js

@@ -8,9 +8,11 @@ class SmoothAreaChart extends PointChart {
      * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
      * @param {Array<Object>} data - The data to visualize on the chart
      * @param {Object} settings - The settings for the chart
+     * @param {ZoomManager} zoom - The zoom manager for the chart.
      */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**
@@ -29,36 +31,34 @@ class SmoothAreaChart extends PointChart {
             this.ctx.strokeStyle = categ.color
 
             // Calculate the starting point for the line
-            let x = this.bounds.left
-            let y = (this.bounds.xAxis - categ.values[0] / this.extreme * this.scale)
-            this.ctx.moveTo(x, y)
+            let pos1 = this.getPointPos(0, categ.values[0])
+            this.ctx.moveTo(pos1.x, pos1.y)
 
             let xmax = 0 // rightmost point (some lines can be shorter)
 
             // Draw the Bezier curve
             for (let i = 0; i < this.dataLen - 1; i++) {
-                // Calculate left point coodrinates
-                let x1 = this.bounds.left + this.bounds.width / (this.dataLen - 1) * i
-                let y1 = this.bounds.xAxis - categ.values[i] / this.extreme * this.scale
+                // Calculate left point coordinates
                 
-                // Calculate right point coodrinates
-                let x2 = this.bounds.left + this.bounds.width / (this.dataLen - 1) * (i + 1)
-                let y2 = this.bounds.xAxis - categ.values[i + 1] / this.extreme * this.scale
+                let leftPos = this.getPointPos(i, categ.values[i])
+
+                // Calculate right point coordinates
+                let rightPos = this.getPointPos(i + 1, categ.values[i + 1])
 
                 // Find middle point
-                let xm = (x1 + x2) / 2
+                let xm = (leftPos.x + rightPos.x) / 2
                 // Find quarter points
-                let xl = (x1 + xm) / 2
-                let xr = (x2 + xm) / 2
+                let xl = (leftPos.x + xm) / 2
+                let xr = (rightPos.x + xm) / 2
 
                 // Draw a curve that smoothly connects the points
-                this.ctx.bezierCurveTo(xl, y1, xr, y2, x2, y2);
-                xmax = x2
+                this.ctx.bezierCurveTo(xl, leftPos.y, xr, rightPos.y, rightPos.x, rightPos.y);
+                xmax = rightPos.x
             }
 
             // Complete the area by connecting the last point to the x-axis
-            this.ctx.lineTo(xmax, this.bounds.xAxis)
-            this.ctx.lineTo(this.bounds.left, this.bounds.xAxis)
+            this.ctx.lineTo(xmax, this.zoomBounds.xAxis)
+            this.ctx.lineTo(this.zoomBounds.left, this.zoomBounds.xAxis)
 
             // Set transparency and fill the area
             this.ctx.globalAlpha = 0.5

public/scripts/charts/smooth_line_chart.js

@@ -8,9 +8,11 @@ class SmoothLineChart extends PointChart {
      * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
      * @param {Array<Object>} data - The data to visualize on the chart
      * @param {Object} settings - The settings for the chart
+     * @param {ZoomManager} zoom - The zoom manager for the chart.
      */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**
@@ -29,28 +31,25 @@ class SmoothLineChart extends PointChart {
             this.ctx.strokeStyle = categ.color
 
             // Calculate the starting point for the line
-            let x = this.bounds.left
-            let y = (this.bounds.xAxis - categ.values[0] / this.extreme * this.scale)
-            this.ctx.moveTo(x, y)
+            let pos1 = this.getPointPos(0, categ.values[0])
+            this.ctx.moveTo(pos1.x, pos1.y)
 
             // Draw the Bezier curve for the smooth line
             for (let i = 0; i < this.dataLen - 1; i++) {
-                // Calculate left point coodrinates
-                let x1 = this.bounds.left + this.bounds.width / (this.dataLen - 1) * i
-                let y1 = this.bounds.xAxis - categ.values[i] / this.extreme * this.scale
+                // Calculate left point coordinates
+                let leftPos = this.getPointPos(i, categ.values[i])
 
-                // Calculate right point coodrinates
-                let x2 = this.bounds.left + this.bounds.width / (this.dataLen - 1) * (i + 1)
-                let y2 = this.bounds.xAxis - categ.values[i + 1] / this.extreme * this.scale
+                // Calculate right point coordinates
+                let rightPos = this.getPointPos(i + 1, categ.values[i + 1])
 
                 // Find middle point
-                let xm = (x1 + x2) / 2
+                let xm = (leftPos.x + rightPos.x) / 2
                 // Find quarter points
-                let xl = (x1 + xm) / 2
-                let xr = (x2 + xm) / 2
+                let xl = (leftPos.x + xm) / 2
+                let xr = (rightPos.x + xm) / 2
 
                 // Draw a curve that smoothly connects the points
-                this.ctx.bezierCurveTo(xl, y1, xr, y2, x2, y2);
+                this.ctx.bezierCurveTo(xl, leftPos.y, xr, rightPos.y, rightPos.x, rightPos.y);
             }
             this.ctx.stroke()
             this.ctx.closePath()

public/scripts/charts/stacked_chart.js

@@ -8,9 +8,11 @@ class StackedChart extends Chart {
      * @param {HTMLCanvasElement} canvas - The canvas element to draw the chart on
      * @param {Array<Object>} data - The data to visualize on the chart
      * @param {Object} settings - The settings for the chart
+     * @param {ZoomManager} zoom - The zoom manager for the chart.
      */
-    constructor(canvas, data, settings) {
-        super(canvas, data, settings)
+    constructor(canvas, data, settings, zoom) {
+        // Call the constructor of the parent class (Chart)
+        super(canvas, data, settings, zoom)
     }
 
     /**
@@ -38,14 +40,14 @@ class StackedChart extends Chart {
         this.drawAxis(false)
 
         // Calculate the size of each bar segment based on the canvas width and number of data points
-        let size = this.bounds.width / this.dataLen
+        let size = this.zoomBounds.width / this.dataLen
         // Calculate the actual width of each bar, making it 70% of the calculated size
         let bar_width = size * 0.7
 
         // Iterate over each data point to draw the stacked bars
         for (let i = 0; i < this.dataLen; i++) {
             // The top position of the last stacked bar segment
-            let last_top = this.bounds.xAxis
+            let last_top = this.zoomBounds.xAxis
             // Counter to determine the first category in each data point
             let num = 0
 
@@ -53,9 +55,9 @@ class StackedChart extends Chart {
                 // Value of the bar segment
                 let value = categ.values[i]
                 // The height of the bar segment relative to the largest total value
-                let bar_height = value / largest * this.bounds.height
+                let bar_height = value / largest * this.zoomBounds.height
                 // The left position of the bar segment
-                let left = this.bounds.left + size * (i + 0.15)
+                let left = this.zoomBounds.left + size * (i + 0.15)
                 // The top position of the bar segment
                 let top = last_top - bar_height
 
@@ -73,17 +75,29 @@ class StackedChart extends Chart {
                     this.ctx.font = "16px Arial"
                     this.ctx.fillStyle = "black"
                     this.ctx.textAlign = "center"
-                    this.ctx.fillText(text, this.bounds.width / this.dataLen * i + size / 2 + this.bounds.left, this.bounds.bottom + 15)
+                    this.ctx.fillText(text, this.zoomBounds.width / this.dataLen * i + size / 2 + this.zoomBounds.left, this.zoomBounds.bottom + 15)
                     this.ctx.stroke()
                     this.ctx.closePath()
                 }
                 num++
 
-                // Set the fill color and draw the rectangle for the current bar segment
-                this.ctx.fillStyle = categ.color
-                let new_object = new Rectangle(this.ctx, value, colId, left, top, bar_width, bar_height)
-                new_object.draw()
-                this.objects.push(new_object)
+                // Increment the count of bars
+                num++
+
+                // Create a new Rectangle object representing the current bar
+                let newObject = new Rectangle(this.ctx, value, colId, left, top, bar_width, bar_height)
+                // Add the new Rectangle object to the list of objects
+                this.objects.push(newObject)
+
+                // Check if the center of the new bar is within the bounds
+                if (this.isInBounds(newObject.getCenter())) {
+                    // Set the fill color to the category color
+                    this.ctx.fillStyle = categ.color
+                    // Set the line width to 0 to prevent drawing the border
+                    this.ctx.lineWidth = 0
+                    // Draw the filled rectangle representing the current bar
+                    newObject.draw()
+                }
             })
         }
     }

public/scripts/zoom_manager.js

@@ -0,0 +1,79 @@
+class ZoomManager {
+    constructor(horizontalZoom, verticalZoom) {
+        this.x = 0
+        this.y = 0
+        this.scaleX = 1
+        this.scaleY = 1
+        this.horizontalZoom = horizontalZoom
+        this.verticalZoom = verticalZoom
+    }
+
+    /**
+     * Convert world coordinates to screen coordinates.
+     * 
+     * @param {number} worldX - The x-coordinate in world space.
+     * @param {number} worldY - The y-coordinate in world space.
+     * @returns {Array} The screen coordinates [screenX, screenY].
+     */
+    worldToScreen(worldX, worldY) {
+        let screenX = (worldX - this.x) * this.scaleX
+        let screenY = (worldY - this.y) * this.scaleY
+        return {
+            x: screenX,
+            y: screenY
+        }
+    }
+
+    /**
+     * Convert screen coordinates to world coordinates.
+     * 
+     * @param {number} screenX - The x-coordinate on the screen.
+     * @param {number} screenY - The y-coordinate on the screen.
+     * @returns {Array} The world coordinates [worldX, worldY].
+     */
+    screenToWorld(screenX, screenY) {
+        let worldX = screenX / this.scaleX + this.x
+        let worldY = screenY / this.scaleY + this.y
+        return {
+            x: worldX,
+            y: worldY
+        }
+    }
+
+    /**
+     * Recalculates zoom based on mouse wheel event.
+     * @param {MouseEvent} event - The mouse wheel event object.
+     */
+    recalculate(event) {
+        // Get mouse position
+        const pos = {
+            x: event.clientX,
+            y: event.clientY
+        }
+
+        // Calculate world coordinates before zoom
+        let beforeZoom, afterZoom
+        beforeZoom = this.screenToWorld(pos.x, pos.y)
+
+        // Adjust zoom scale based on mouse wheel delta
+        if (this.horizontalZoom)
+            this.scaleX -= (10 * this.scaleX) / event.deltaY;
+        if (this.verticalZoom)
+            this.scaleY -= (10 * this.scaleY) / event.deltaY;
+
+        // Calculate world coordinates after zoom
+        afterZoom = this.screenToWorld(pos.x, pos.y)
+
+        // Adjust zoom position to keep zoom centered around mouse position
+        this.x += beforeZoom.x - afterZoom.x
+        this.y += beforeZoom.y - afterZoom.y
+
+        // Reset zoom if it goes below 1
+        if (this.scaleX < 1 || this.scaleY < 1) {
+            this.x = 0
+            this.y = 0
+            this.scaleX = 1
+            this.scaleY = 1
+        }
+    }
+}

src/Form/Type/MetadataType.php

@@ -133,6 +133,22 @@ class MetadataType extends AbstractType
                         'required' => false,
                     ])
             )
+            // Zoom settings
+            ->add(
+                $builder->create('group5', FormType::class, [
+                    'inherit_data' => true,
+                    'label' => 'Zoom Settings',
+                    'label_attr' => ['class' => 'submenuLabel']
+                ])
+                    ->add('horizontalZoom', CheckboxType::class, [
+                        'label' => 'Enable horizontal zoom',
+                        'required' => false,
+                    ])
+                    ->add('verticalZoom', CheckboxType::class, [
+                        'label' => 'Enable vertical zoom',
+                        'required' => false,
+                    ])
+            )
             ->add('backgroundColor', ColorType::class, [
                 'label' => 'Background color',
                 'required' => false,

templates/chart.html.twig

@@ -11,6 +11,7 @@
 
 {% block javascripts %}
 	{{ parent() }}
+	<script type="text/javascript" src={{ asset('/scripts/zoom_manager.js') }}></script>
 	<script type="text/javascript" src={{ asset('/scripts/charts/primitives.js') }}></script>
 	<script type="text/javascript" src={{ asset('/scripts/charts/chart.js') }}></script>
 	<script type="text/javascript" src={{ asset('/scripts/charts/point_chart.js') }}></script>

templates/edit.html.twig

@@ -19,7 +19,7 @@
 	<main>
 		{{ form_start(form) }}
 		<div id="mainDiv">
-			<object id="graphDiv" data={{ "https://spacek.blue/charts/" ~ field_value(form.code) }}></object>
+			<iframe id="graphDiv" src={{ "https://spacek.blue/charts/" ~ field_value(form.code) }}></iframe>
 			<div id="settings_div">
                 {{ form_row(form.name) }}
                 {{ form_row(form.code) }}