@rinminase/ng-charts
Version:
Reactive, responsive, beautiful charts for Angular based on ng2-charts
327 lines • 48.3 kB
JavaScript
export function monkeyPatchChartJsLegend() {
if (typeof Chart === "undefined") {
console.log("Chart not defined");
return;
}
const plugins = Chart.plugins.getAll();
const legend = plugins.filter((p) => p.id === "legend")[0];
legend._element.prototype.fit = fit;
legend._element.prototype.draw = draw;
const helpers = Chart.helpers;
const defaults = Chart.defaults;
const valueOrDefault = helpers.valueOrDefault;
function getBoxWidth(labelOpts, fontSize) {
return labelOpts.usePointStyle && labelOpts.boxWidth > fontSize
? fontSize
: labelOpts.boxWidth;
}
function fit() {
let me = this;
let opts = me.options;
let labelOpts = opts.labels;
let display = opts.display;
let ctx = me.ctx;
let labelFont = helpers.options._parseFont(labelOpts);
let fontSize = labelFont.size;
// Reset hit boxes
let hitboxes = (me.legendHitBoxes = []);
let minSize = me.minSize;
let isHorizontal = me.isHorizontal();
if (isHorizontal) {
minSize.width = me.maxWidth; // fill all the width
minSize.height = display ? 10 : 0;
}
else {
minSize.width = display ? 10 : 0;
minSize.height = me.maxHeight; // fill all the height
}
let getMaxLineWidth = function (textLines) {
return textLines
.map(function (textLine) {
return ctx.measureText(textLine).width;
})
.reduce(function (acc, v) {
return v > acc ? v : acc;
}, 0);
};
// Increase sizes here
if (display) {
ctx.font = labelFont.string;
if (isHorizontal) {
// Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one
let lineWidths = (me.lineWidths = [0]);
let lineHeights = (me.lineHeights = []);
let currentLineHeight = 0;
let lineIndex = 0;
ctx.textAlign = "left";
ctx.textBaseline = "top";
helpers.each(me.legendItems, function (legendItem, i) {
let width, height;
if (helpers.isArray(legendItem.text)) {
width = getMaxLineWidth(legendItem.text);
height = fontSize * legendItem.text.length + labelOpts.padding;
}
else {
width = ctx.measureText(legendItem.text).width;
height = fontSize + labelOpts.padding;
}
width += getBoxWidth(labelOpts, fontSize) + fontSize / 2;
if (lineWidths[lineWidths.length - 1] + width + 2 * labelOpts.padding >
minSize.width) {
lineHeights.push(currentLineHeight);
currentLineHeight = 0;
lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = 0;
lineIndex++;
}
legendItem.lineOrColumnIndex = lineIndex;
if (height > currentLineHeight) {
currentLineHeight = height;
}
// Store the hitbox width and height here. Final position will be updated in `draw`
hitboxes[i] = {
left: 0,
top: 0,
width: width,
height: height,
};
lineWidths[lineWidths.length - 1] += width + labelOpts.padding;
});
lineHeights.push(currentLineHeight);
minSize.height += lineHeights.reduce(function (acc, v) {
return acc + v;
}, 0);
}
else {
let vPadding = labelOpts.padding;
let columnWidths = (me.columnWidths = []);
let columnHeights = (me.columnHeights = []);
let totalWidth = labelOpts.padding;
let currentColWidth = 0;
let currentColHeight = 0;
let columnIndex = 0;
helpers.each(me.legendItems, function (legendItem, i) {
let itemWidth;
let height;
if (helpers.isArray(legendItem.text)) {
itemWidth = getMaxLineWidth(legendItem.text);
height = fontSize * legendItem.text.length;
}
else {
itemWidth = ctx.measureText(legendItem.text).width;
height = fontSize;
}
itemWidth += getBoxWidth(labelOpts, fontSize) + fontSize / 2;
// If too tall, go to new column
if (currentColHeight + fontSize + 2 * vPadding > minSize.height) {
totalWidth += currentColWidth + labelOpts.padding;
columnWidths.push(currentColWidth); // previous column width
columnHeights.push(currentColHeight);
currentColWidth = 0;
currentColHeight = 0;
columnIndex++;
}
legendItem.lineOrColumnIndex = columnIndex;
// Get max width
currentColWidth = Math.max(currentColWidth, itemWidth);
currentColHeight += height + vPadding;
// Store the hitbox width and height here. Final position will be updated in `draw`
hitboxes[i] = {
left: 0,
top: 0,
width: itemWidth,
height: height,
};
});
totalWidth += currentColWidth;
columnWidths.push(currentColWidth);
columnHeights.push(currentColHeight);
minSize.width += totalWidth;
}
}
me.width = minSize.width;
me.height = minSize.height;
}
function draw() {
let me = this;
let opts = me.options;
let labelOpts = opts.labels;
let globalDefaults = defaults.global;
let defaultColor = globalDefaults.defaultColor;
let lineDefault = globalDefaults.elements.line;
let legendHeight = me.height;
let columnHeights = me.columnHeights;
let columnWidths = me.columnWidths;
let legendWidth = me.width;
let lineWidths = me.lineWidths;
let lineHeights = me.lineHeights;
if (opts.display) {
let ctx = me.ctx;
let fontColor = valueOrDefault(labelOpts.fontColor, globalDefaults.defaultFontColor);
let labelFont = helpers.options._parseFont(labelOpts);
let fontSize = labelFont.size;
let cursor;
// Canvas setup
ctx.textAlign = "left";
ctx.textBaseline = "middle";
ctx.lineWidth = 0.5;
ctx.strokeStyle = fontColor; // for strikethrough effect
ctx.fillStyle = fontColor; // render in correct colour
ctx.font = labelFont.string;
let boxWidth = getBoxWidth(labelOpts, fontSize);
let hitboxes = me.legendHitBoxes;
// current position
let drawLegendBox = function (x, y, legendItem) {
if (isNaN(boxWidth) || boxWidth <= 0) {
return;
}
// Set the ctx for the box
ctx.save();
let lineWidth = valueOrDefault(legendItem.lineWidth, lineDefault.borderWidth);
ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);
ctx.lineCap = valueOrDefault(legendItem.lineCap, lineDefault.borderCapStyle);
ctx.lineDashOffset = valueOrDefault(legendItem.lineDashOffset, lineDefault.borderDashOffset);
ctx.lineJoin = valueOrDefault(legendItem.lineJoin, lineDefault.borderJoinStyle);
ctx.lineWidth = lineWidth;
ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);
if (ctx.setLineDash) {
// IE 9 and 10 do not support line dash
ctx.setLineDash(valueOrDefault(legendItem.lineDash, lineDefault.borderDash));
}
if (opts.labels && opts.labels.usePointStyle) {
// Recalculate x and y for drawPoint() because its expecting
// x and y to be center of figure (instead of top left)
let radius = (boxWidth * Math.SQRT2) / 2;
let centerX = x + boxWidth / 2;
let centerY = y + fontSize / 2;
// Draw pointStyle as legend symbol
helpers.canvas.drawPoint(ctx, legendItem.pointStyle, radius, centerX, centerY);
}
else {
// Draw box as legend symbol
if (lineWidth !== 0) {
ctx.strokeRect(x, y, boxWidth, fontSize);
}
ctx.fillRect(x, y, boxWidth, fontSize);
}
ctx.restore();
};
let drawStrikeThrough = function (x, y, w) {
ctx.beginPath();
ctx.lineWidth = 2;
ctx.moveTo(x, y);
ctx.lineTo(x + w, y);
ctx.stroke();
};
let drawCrossOver = function (x, y, w, h) {
ctx.beginPath();
ctx.lineWidth = 2;
ctx.moveTo(x, y);
ctx.lineTo(x + w, y + h);
ctx.moveTo(x, y + h);
ctx.lineTo(x + w, y);
ctx.stroke();
};
let fillText = function (x, y, legendItem, textWidth) {
let halfFontSize = fontSize / 2;
let xLeft = boxWidth + halfFontSize + x;
let yMiddle = y + halfFontSize;
if (helpers.isArray(legendItem.text)) {
helpers.each(legendItem.text, function (textLine, index) {
let lineOffset = index * fontSize;
ctx.fillText(textLine, xLeft, yMiddle + lineOffset);
});
}
else {
ctx.fillText(legendItem.text, xLeft, yMiddle);
}
if (legendItem.hidden) {
if (helpers.isArray(legendItem.text)) {
drawCrossOver(xLeft, yMiddle, textWidth, (legendItem.text.length - 1) * (fontSize - 1));
}
else {
drawStrikeThrough(xLeft, yMiddle, textWidth);
}
}
};
let alignmentOffset = function (dimension, blockSize) {
switch (opts.align) {
case "start":
return labelOpts.padding;
case "end":
return dimension - blockSize;
default:
// center
return (dimension - blockSize + labelOpts.padding) / 2;
}
};
// Horizontal
let isHorizontal = me.isHorizontal();
if (isHorizontal) {
cursor = {
x: me.left + alignmentOffset(legendWidth, lineWidths[0]),
y: me.top + labelOpts.padding,
line: 0,
};
}
else {
cursor = {
x: me.left + labelOpts.padding,
y: me.top + alignmentOffset(legendHeight, columnHeights[0]),
line: 0,
};
}
helpers.each(me.legendItems, function (legendItem, i) {
let textWidth, height, boxTopOffset;
if (legendItem.lineOrColumnIndex > cursor.line) {
if (isHorizontal) {
cursor.y += lineHeights[cursor.line];
cursor.line = legendItem.lineOrColumnIndex;
cursor.x =
me.left + alignmentOffset(legendWidth, lineWidths[cursor.line]);
}
else {
cursor.x += columnWidths[cursor.line] + labelOpts.padding;
cursor.line = legendItem.lineOrColumnIndex;
cursor.y =
me.top +
alignmentOffset(legendHeight, columnHeights[cursor.line]);
}
}
if (helpers.isArray(legendItem.text)) {
textWidth = legendItem.text
.map(function (textLine) {
return ctx.measureText(textLine).width;
})
.reduce(function (acc, v) {
return v > acc ? v : acc;
}, 0);
boxTopOffset = (fontSize / 2) * (legendItem.text.length - 1);
height = fontSize * legendItem.text.length;
}
else {
textWidth = ctx.measureText(legendItem.text).width;
boxTopOffset = 0;
height = fontSize;
}
let width = boxWidth + fontSize / 2 + textWidth;
let x = cursor.x;
let y = cursor.y;
let topOffset = isHorizontal
? Math.trunc((lineHeights[cursor.line] - hitboxes[i].height) / 2)
: 0;
drawLegendBox(x, y + boxTopOffset + topOffset, legendItem);
hitboxes[i].left = x;
hitboxes[i].top = y;
// Fill the actual label
fillText(x, y + topOffset, legendItem, textWidth);
if (isHorizontal) {
cursor.x += width + labelOpts.padding;
}
else {
cursor.y += height + labelOpts.padding;
}
});
}
}
}
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class Chart {\n  static readonly Chart: typeof Chart;\n  static readonly Tooltip: any;\n  static readonly helpers: any;\n  static readonly defaults: any;\n  static readonly plugins: any;\n}\n\nexport function monkeyPatchChartJsLegend() {\n  if (typeof Chart === \"undefined\") {\n    console.log(\"Chart not defined\");\n    return;\n  }\n  const plugins = Chart.plugins.getAll();\n  const legend = plugins.filter((p) => p.id === \"legend\")[0];\n  legend._element.prototype.fit = fit;\n  legend._element.prototype.draw = draw;\n\n  const helpers = Chart.helpers;\n  const defaults = Chart.defaults;\n  const valueOrDefault = helpers.valueOrDefault;\n\n  function getBoxWidth(labelOpts, fontSize) {\n    return labelOpts.usePointStyle && labelOpts.boxWidth > fontSize\n      ? fontSize\n      : labelOpts.boxWidth;\n  }\n\n  function fit() {\n    let me = this;\n    let opts = me.options;\n    let labelOpts = opts.labels;\n    let display = opts.display;\n\n    let ctx = me.ctx;\n\n    let labelFont = helpers.options._parseFont(labelOpts);\n    let fontSize = labelFont.size;\n\n    // Reset hit boxes\n    let hitboxes = (me.legendHitBoxes = []);\n\n    let minSize = me.minSize;\n    let isHorizontal = me.isHorizontal();\n\n    if (isHorizontal) {\n      minSize.width = me.maxWidth; // fill all the width\n      minSize.height = display ? 10 : 0;\n    } else {\n      minSize.width = display ? 10 : 0;\n      minSize.height = me.maxHeight; // fill all the height\n    }\n\n    let getMaxLineWidth = function (textLines) {\n      return textLines\n        .map(function (textLine) {\n          return ctx.measureText(textLine).width;\n        })\n        .reduce(function (acc, v) {\n          return v > acc ? v : acc;\n        }, 0);\n    };\n\n    // Increase sizes here\n    if (display) {\n      ctx.font = labelFont.string;\n\n      if (isHorizontal) {\n        // Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one\n        let lineWidths = (me.lineWidths = [0]);\n        let lineHeights = (me.lineHeights = []);\n        let currentLineHeight = 0;\n        let lineIndex = 0;\n\n        ctx.textAlign = \"left\";\n        ctx.textBaseline = \"top\";\n\n        helpers.each(me.legendItems, function (legendItem, i) {\n          let width, height;\n\n          if (helpers.isArray(legendItem.text)) {\n            width = getMaxLineWidth(legendItem.text);\n            height = fontSize * legendItem.text.length + labelOpts.padding;\n          } else {\n            width = ctx.measureText(legendItem.text).width;\n            height = fontSize + labelOpts.padding;\n          }\n          width += getBoxWidth(labelOpts, fontSize) + fontSize / 2;\n\n          if (\n            lineWidths[lineWidths.length - 1] + width + 2 * labelOpts.padding >\n            minSize.width\n          ) {\n            lineHeights.push(currentLineHeight);\n            currentLineHeight = 0;\n            lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = 0;\n            lineIndex++;\n          }\n\n          legendItem.lineOrColumnIndex = lineIndex;\n\n          if (height > currentLineHeight) {\n            currentLineHeight = height;\n          }\n\n          // Store the hitbox width and height here. Final position will be updated in `draw`\n          hitboxes[i] = {\n            left: 0,\n            top: 0,\n            width: width,\n            height: height,\n          };\n\n          lineWidths[lineWidths.length - 1] += width + labelOpts.padding;\n        });\n\n        lineHeights.push(currentLineHeight);\n        minSize.height += lineHeights.reduce(function (acc, v) {\n          return acc + v;\n        }, 0);\n      } else {\n        let vPadding = labelOpts.padding;\n        let columnWidths = (me.columnWidths = []);\n        let columnHeights = (me.columnHeights = []);\n        let totalWidth = labelOpts.padding;\n        let currentColWidth = 0;\n        let currentColHeight = 0;\n        let columnIndex = 0;\n\n        helpers.each(me.legendItems, function (legendItem, i) {\n          let itemWidth;\n          let height;\n\n          if (helpers.isArray(legendItem.text)) {\n            itemWidth = getMaxLineWidth(legendItem.text);\n            height = fontSize * legendItem.text.length;\n          } else {\n            itemWidth = ctx.measureText(legendItem.text).width;\n            height = fontSize;\n          }\n          itemWidth += getBoxWidth(labelOpts, fontSize) + fontSize / 2;\n\n          // If too tall, go to new column\n          if (currentColHeight + fontSize + 2 * vPadding > minSize.height) {\n            totalWidth += currentColWidth + labelOpts.padding;\n            columnWidths.push(currentColWidth); // previous column width\n            columnHeights.push(currentColHeight);\n            currentColWidth = 0;\n            currentColHeight = 0;\n            columnIndex++;\n          }\n\n          legendItem.lineOrColumnIndex = columnIndex;\n\n          // Get max width\n          currentColWidth = Math.max(currentColWidth, itemWidth);\n          currentColHeight += height + vPadding;\n\n          // Store the hitbox width and height here. Final position will be updated in `draw`\n          hitboxes[i] = {\n            left: 0,\n            top: 0,\n            width: itemWidth,\n            height: height,\n          };\n        });\n\n        totalWidth += currentColWidth;\n        columnWidths.push(currentColWidth);\n        columnHeights.push(currentColHeight);\n        minSize.width += totalWidth;\n      }\n    }\n\n    me.width = minSize.width;\n    me.height = minSize.height;\n  }\n\n  function draw() {\n    let me = this;\n    let opts = me.options;\n    let labelOpts = opts.labels;\n    let globalDefaults = defaults.global;\n    let defaultColor = globalDefaults.defaultColor;\n    let lineDefault = globalDefaults.elements.line;\n    let legendHeight = me.height;\n    let columnHeights = me.columnHeights;\n    let columnWidths = me.columnWidths;\n    let legendWidth = me.width;\n    let lineWidths = me.lineWidths;\n    let lineHeights = me.lineHeights;\n\n    if (opts.display) {\n      let ctx = me.ctx;\n      let fontColor = valueOrDefault(\n        labelOpts.fontColor,\n        globalDefaults.defaultFontColor\n      );\n      let labelFont = helpers.options._parseFont(labelOpts);\n      let fontSize = labelFont.size;\n      let cursor;\n\n      // Canvas setup\n      ctx.textAlign = \"left\";\n      ctx.textBaseline = \"middle\";\n      ctx.lineWidth = 0.5;\n      ctx.strokeStyle = fontColor; // for strikethrough effect\n      ctx.fillStyle = fontColor; // render in correct colour\n      ctx.font = labelFont.string;\n\n      let boxWidth = getBoxWidth(labelOpts, fontSize);\n      let hitboxes = me.legendHitBoxes;\n\n      // current position\n      let drawLegendBox = function (x, y, legendItem) {\n        if (isNaN(boxWidth) || boxWidth <= 0) {\n          return;\n        }\n\n        // Set the ctx for the box\n        ctx.save();\n\n        let lineWidth = valueOrDefault(\n          legendItem.lineWidth,\n          lineDefault.borderWidth\n        );\n        ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);\n        ctx.lineCap = valueOrDefault(\n          legendItem.lineCap,\n          lineDefault.borderCapStyle\n        );\n        ctx.lineDashOffset = valueOrDefault(\n          legendItem.lineDashOffset,\n          lineDefault.borderDashOffset\n        );\n        ctx.lineJoin = valueOrDefault(\n          legendItem.lineJoin,\n          lineDefault.borderJoinStyle\n        );\n        ctx.lineWidth = lineWidth;\n        ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);\n\n        if (ctx.setLineDash) {\n          // IE 9 and 10 do not support line dash\n          ctx.setLineDash(\n            valueOrDefault(legendItem.lineDash, lineDefault.borderDash)\n          );\n        }\n\n        if (opts.labels && opts.labels.usePointStyle) {\n          // Recalculate x and y for drawPoint() because its expecting\n          // x and y to be center of figure (instead of top left)\n          let radius = (boxWidth * Math.SQRT2) / 2;\n          let centerX = x + boxWidth / 2;\n          let centerY = y + fontSize / 2;\n\n          // Draw pointStyle as legend symbol\n          helpers.canvas.drawPoint(\n            ctx,\n            legendItem.pointStyle,\n            radius,\n            centerX,\n            centerY\n          );\n        } else {\n          // Draw box as legend symbol\n          if (lineWidth !== 0) {\n            ctx.strokeRect(x, y, boxWidth, fontSize);\n          }\n          ctx.fillRect(x, y, boxWidth, fontSize);\n        }\n\n        ctx.restore();\n      };\n\n      let drawStrikeThrough = function (x, y, w) {\n        ctx.beginPath();\n        ctx.lineWidth = 2;\n        ctx.moveTo(x, y);\n        ctx.lineTo(x + w, y);\n        ctx.stroke();\n      };\n\n      let drawCrossOver = function (x, y, w, h) {\n        ctx.beginPath();\n        ctx.lineWidth = 2;\n        ctx.moveTo(x, y);\n        ctx.lineTo(x + w, y + h);\n        ctx.moveTo(x, y + h);\n        ctx.lineTo(x + w, y);\n        ctx.stroke();\n      };\n\n      let fillText = function (x, y, legendItem, textWidth) {\n        let halfFontSize = fontSize / 2;\n        let xLeft = boxWidth + halfFontSize + x;\n        let yMiddle = y + halfFontSize;\n\n        if (helpers.isArray(legendItem.text)) {\n          helpers.each(legendItem.text, function (textLine, index) {\n            let lineOffset = index * fontSize;\n            ctx.fillText(textLine, xLeft, yMiddle + lineOffset);\n          });\n        } else {\n          ctx.fillText(legendItem.text, xLeft, yMiddle);\n        }\n\n        if (legendItem.hidden) {\n          if (helpers.isArray(legendItem.text)) {\n            drawCrossOver(\n              xLeft,\n              yMiddle,\n              textWidth,\n              (legendItem.text.length - 1) * (fontSize - 1)\n            );\n          } else {\n            drawStrikeThrough(xLeft, yMiddle, textWidth);\n          }\n        }\n      };\n\n      let alignmentOffset = function (dimension, blockSize) {\n        switch (opts.align) {\n          case \"start\":\n            return labelOpts.padding;\n          case \"end\":\n            return dimension - blockSize;\n          default:\n            // center\n            return (dimension - blockSize + labelOpts.padding) / 2;\n        }\n      };\n\n      // Horizontal\n      let isHorizontal = me.isHorizontal();\n      if (isHorizontal) {\n        cursor = {\n          x: me.left + alignmentOffset(legendWidth, lineWidths[0]),\n          y: me.top + labelOpts.padding,\n          line: 0,\n        };\n      } else {\n        cursor = {\n          x: me.left + labelOpts.padding,\n          y: me.top + alignmentOffset(legendHeight, columnHeights[0]),\n          line: 0,\n        };\n      }\n\n      helpers.each(me.legendItems, function (legendItem, i) {\n        let textWidth, height, boxTopOffset;\n\n        if (legendItem.lineOrColumnIndex > cursor.line) {\n          if (isHorizontal) {\n            cursor.y += lineHeights[cursor.line];\n            cursor.line = legendItem.lineOrColumnIndex;\n            cursor.x =\n              me.left + alignmentOffset(legendWidth, lineWidths[cursor.line]);\n          } else {\n            cursor.x += columnWidths[cursor.line] + labelOpts.padding;\n            cursor.line = legendItem.lineOrColumnIndex;\n            cursor.y =\n              me.top +\n              alignmentOffset(legendHeight, columnHeights[cursor.line]);\n          }\n        }\n\n        if (helpers.isArray(legendItem.text)) {\n          textWidth = legendItem.text\n            .map(function (textLine) {\n              return ctx.measureText(textLine).width;\n            })\n            .reduce(function (acc, v) {\n              return v > acc ? v : acc;\n            }, 0);\n          boxTopOffset = (fontSize / 2) * (legendItem.text.length - 1);\n          height = fontSize * legendItem.text.length;\n        } else {\n          textWidth = ctx.measureText(legendItem.text).width;\n          boxTopOffset = 0;\n          height = fontSize;\n        }\n\n        let width = boxWidth + fontSize / 2 + textWidth;\n        let x = cursor.x;\n        let y = cursor.y;\n\n        let topOffset = isHorizontal\n          ? Math.trunc((lineHeights[cursor.line] - hitboxes[i].height) / 2)\n          : 0;\n\n        drawLegendBox(x, y + boxTopOffset + topOffset, legendItem);\n\n        hitboxes[i].left = x;\n        hitboxes[i].top = y;\n\n        // Fill the actual label\n        fillText(x, y + topOffset, legendItem, textWidth);\n\n        if (isHorizontal) {\n          cursor.x += width + labelOpts.padding;\n        } else {\n          cursor.y += height + labelOpts.padding;\n        }\n      });\n    }\n  }\n}\n"]}