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Thomas Grainger
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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * Various components for drawing diagrams on an HTML5 canvas. | ||
| * | ||
| * @author n1474335 [n1474335@gmail.com] | ||
| * @copyright Crown Copyright 2016 | ||
| * @license Apache-2.0 | ||
| * | ||
| * @constant | ||
| * @namespace | ||
| */ | ||
| const CanvasComponents = { | ||
|
|
||
| draw_line: function(ctx, start_x, start_y, end_x, end_y) { | ||
| ctx.beginPath(); | ||
| ctx.moveTo(start_x, start_y); | ||
| ctx.lineTo(end_x, end_y); | ||
| ctx.closePath(); | ||
| ctx.stroke(); | ||
| }, | ||
|
|
||
| draw_bar_chart: function(canvas, scores, x_axis_label, y_axis_label, num_x_labels, num_y_labels, font_size) { | ||
| font_size = font_size || 15; | ||
| if (!num_x_labels || num_x_labels > Math.round(canvas.width / 50)) { | ||
| num_x_labels = Math.round(canvas.width / 50); | ||
| } | ||
| if (!num_y_labels || num_y_labels > Math.round(canvas.width / 50)) { | ||
| num_y_labels = Math.round(canvas.height / 50); | ||
| } | ||
|
|
||
| // Graph properties | ||
| var ctx = canvas.getContext("2d"), | ||
| left_padding = canvas.width * 0.08, | ||
| right_padding = canvas.width * 0.03, | ||
| top_padding = canvas.height * 0.08, | ||
| bottom_padding = canvas.height * 0.15, | ||
| graph_height = canvas.height - top_padding - bottom_padding, | ||
| graph_width = canvas.width - left_padding - right_padding, | ||
| base = top_padding + graph_height, | ||
| ceil = top_padding; | ||
|
|
||
| ctx.font = font_size + "px Arial"; | ||
|
|
||
| // Draw axis | ||
| ctx.lineWidth = "1.0"; | ||
| ctx.strokeStyle = "#444"; | ||
| CanvasComponents.draw_line(ctx, left_padding, base, graph_width + left_padding, base); // x | ||
| CanvasComponents.draw_line(ctx, left_padding, base, left_padding, ceil); // y | ||
|
|
||
| // Bar properties | ||
| var bar_padding = graph_width * 0.003, | ||
| bar_width = (graph_width - (bar_padding * scores.length)) / scores.length, | ||
| curr_x = left_padding + bar_padding, | ||
| max = Math.max.apply(Math, scores); | ||
|
|
||
| // Draw bars | ||
| ctx.fillStyle = "green"; | ||
| for (var i = 0; i < scores.length; i++) { | ||
| var h = scores[i] / max * graph_height; | ||
| ctx.fillRect(curr_x, base - h, bar_width, h); | ||
| curr_x += bar_width + bar_padding; | ||
| } | ||
|
|
||
| // Mark x axis | ||
| ctx.fillStyle = "black"; | ||
| ctx.textAlign = "center"; | ||
| curr_x = left_padding + bar_padding; | ||
| if (num_x_labels >= scores.length) { | ||
| // Mark every score | ||
| for (var i = 0; i <= scores.length; i++) { | ||
| ctx.fillText(i, curr_x, base + (bottom_padding * 0.3)); | ||
| curr_x += bar_width + bar_padding; | ||
| } | ||
| } else { | ||
| // Mark some scores | ||
| for (var i = 0; i <= num_x_labels; i++) { | ||
| var val = Math.ceil((scores.length / num_x_labels) * i); | ||
| curr_x = (graph_width / num_x_labels) * i + left_padding; | ||
| ctx.fillText(val, curr_x, base + (bottom_padding * 0.3)); | ||
| } | ||
| } | ||
|
|
||
| // Mark y axis | ||
| ctx.textAlign = "right"; | ||
| var curr_y; | ||
| if (num_y_labels >= max) { | ||
| // Mark every increment | ||
| for (var i = 0; i <= max; i++) { | ||
| curr_y = base - (i / max * graph_height) + font_size / 3; | ||
| ctx.fillText(i, left_padding * 0.8, curr_y); | ||
| } | ||
| } else { | ||
| // Mark some increments | ||
| for (var i = 0; i <= num_y_labels; i++) { | ||
| var val = Math.ceil((max / num_y_labels) * i); | ||
| curr_y = base - (val / max * graph_height) + font_size / 3; | ||
| ctx.fillText(val, left_padding * 0.8, curr_y); | ||
| } | ||
| } | ||
|
|
||
| // Label x axis | ||
| if (x_axis_label) { | ||
| ctx.textAlign = "center"; | ||
| ctx.fillText(x_axis_label, graph_width / 2 + left_padding, base + bottom_padding * 0.8); | ||
| } | ||
|
|
||
| // Label y axis | ||
| if (y_axis_label) { | ||
| ctx.save(); | ||
| var x = left_padding * 0.3, | ||
| y = graph_height / 2 + top_padding; | ||
| ctx.translate(x, y); | ||
| ctx.rotate(-Math.PI / 2); | ||
| ctx.textAlign = "center"; | ||
| ctx.fillText(y_axis_label, 0, 0); | ||
| ctx.restore(); | ||
| } | ||
| }, | ||
|
|
||
| draw_scale_bar: function(canvas, score, max, markings) { | ||
| // Bar properties | ||
| var ctx = canvas.getContext("2d"), | ||
| left_padding = canvas.width * 0.01, | ||
| right_padding = canvas.width * 0.01, | ||
| top_padding = canvas.height * 0.1, | ||
| bottom_padding = canvas.height * 0.3, | ||
| bar_height = canvas.height - top_padding - bottom_padding, | ||
| bar_width = canvas.width - left_padding - right_padding; | ||
|
|
||
| // Scale properties | ||
| var proportion = score / max; | ||
|
|
||
| // Draw bar outline | ||
| ctx.strokeRect(left_padding, top_padding, bar_width, bar_height); | ||
|
|
||
| // Shade in up to proportion | ||
| var grad = ctx.createLinearGradient(left_padding, 0, bar_width + left_padding, 0); | ||
| grad.addColorStop(0, "green"); | ||
| grad.addColorStop(0.5, "gold"); | ||
| grad.addColorStop(1, "red"); | ||
| ctx.fillStyle = grad; | ||
| ctx.fillRect(left_padding, top_padding, bar_width * proportion, bar_height); | ||
|
|
||
| // Add markings | ||
| var x0, y0, x1, y1; | ||
| ctx.fillStyle = "black"; | ||
| ctx.textAlign = "center"; | ||
| ctx.font = "13px Arial"; | ||
| for (var i = 0; i < markings.length; i++) { | ||
| // Draw min line down | ||
| x0 = bar_width / max * markings[i].min + left_padding; | ||
| y0 = top_padding + bar_height + (bottom_padding * 0.1); | ||
| x1 = x0; | ||
| y1 = top_padding + bar_height + (bottom_padding * 0.3); | ||
| CanvasComponents.draw_line(ctx, x0, y0, x1, y1); | ||
|
|
||
| // Draw max line down | ||
| x0 = bar_width / max * markings[i].max + left_padding; | ||
| x1 = x0; | ||
| CanvasComponents.draw_line(ctx, x0, y0, x1, y1); | ||
|
|
||
| // Join min and max lines | ||
| x0 = bar_width / max * markings[i].min + left_padding; | ||
| y0 = top_padding + bar_height + (bottom_padding * 0.3); | ||
| x1 = bar_width / max * markings[i].max + left_padding; | ||
| y1 = y0; | ||
| CanvasComponents.draw_line(ctx, x0, y0, x1, y1); | ||
|
|
||
| // Add label | ||
| if (markings[i].max >= max * 0.9) { | ||
| ctx.textAlign = "right"; | ||
| x0 = x1; | ||
| } else if (markings[i].max <= max * 0.1) { | ||
| ctx.textAlign = "left"; | ||
| } else { | ||
| x0 = x0 + (x1 - x0) / 2; | ||
| } | ||
| y0 = top_padding + bar_height + (bottom_padding * 0.8); | ||
| ctx.fillText(markings[i].label, x0, y0); | ||
| } | ||
| }, | ||
|
|
||
| }; | ||
|
|
||
| export default CanvasComponents; |