Extract the renderer to it's own file.

2025-11-03 10:02:34 -08:00 · 2016-12-16 10:34:37 -08:00 · 2016-12-16 10:34:37 -08:00 · 049cb0765e
commit 049cb0765e
parent d3ae3f8295
2 changed files with 136 additions and 165 deletions
--- a/js/render-fox.js
+++ b/js/render-fox.js
@ -0,0 +1,134 @@
+var renderFox = function (canvas, opts) {
+    var width = opts.canvas.width;
+    var height = opts.canvas.height;
+    var ctx = canvas.getContext('2d');
+
+    ctx.fillStyle = opts.canvas.color;
+    ctx.fillRect(0, 0, width, height);
+    renderEars(ctx, opts.ears);
+    renderHead(ctx, opts.head);
+    renderEyes(ctx, opts.eyes);
+    renderNose(ctx, opts.nose);
+    renderMouth(ctx, opts.mouth);
+};
+
+function renderHead(ctx, opts) {
+    ctx.save();
+    ctx.translate(ctx.canvas.width/2, ctx.canvas.height/2);
+    ctx.rotate(Math.PI / 4);
+    drawEllipseByCenter(ctx, 0, 0, opts.width, opts.height, opts.color, null, opts.kappa);
+    ctx.restore();
+    ctx.clip();
+    drawEllipseByCenter(ctx, ctx.canvas.width / 2, ctx.canvas.height, opts.maskWidth, opts.maskHeight, '#fff', '#fff', 0.5);
+}
+
+function renderEars(ctx, opts) {
+    var offset = {
+        x: ctx.canvas.width/2,
+        y: ctx.canvas.height/2
+    }
+    ctx.save();
+    ctx.translate(offset.x, offset.y);
+    ctx.rotate(-opts.left.angle);
+    drawEllipseByCenter(ctx, opts.left.x - offset.x, opts.left.y - offset.y, opts.left.width, opts.left.height, opts.color, null, opts.kappa);
+    ctx.restore();
+
+    ctx.save();
+    ctx.translate(offset.x, offset.y);
+    ctx.rotate(-opts.right.angle);
+    drawEllipseByCenter(ctx, opts.right.x - offset.x, opts.right.y - offset.y, opts.right.width, opts.right.height, opts.color, null, opts.kappa);
+    ctx.restore();
+}
+
+function renderEyes(ctx, opts) {
+    switch (opts.style) {
+      case "ellipse":
+        drawEllipseByCenter(ctx, opts.left.x, opts.left.y, opts.width, opts.height, "black", null, 0.5);
+        drawEllipseByCenter(ctx, opts.right.x, opts.right.y, opts.width, opts.height, "black", null, 0.5);
+        break;
+      case "smiley":
+        ctx.strokeStyle = "black";
+        ctx.beginPath();
+        ctx.moveTo(opts.left.x - opts.width, opts.left.y + opts.height);
+        ctx.bezierCurveTo(opts.left.x - opts.width, opts.left.y + opts.height, opts.left.x, opts.left.y, opts.left.x + opts.width, opts.left.y + opts.height);
+        ctx.lineWidth = 2;
+        ctx.stroke();
+        ctx.closePath();
+
+        ctx.beginPath();
+        ctx.moveTo(opts.right.x - opts.width, opts.right.y + opts.height);
+        ctx.bezierCurveTo(opts.right.x - opts.width, opts.right.y + opts.height, opts.right.x, opts.right.y, opts.right.x + opts.width, opts.right.y + opts.height);
+        ctx.lineWidth = 2;
+        ctx.stroke();
+        ctx.closePath();
+        break;
+      case "none":
+        break;
+    }
+}
+
+function renderNose(ctx, opts) {
+
+  ctx.strokeStyle = "black";
+  ctx.beginPath();
+  ctx.moveTo(opts.x - opts.width/2, opts.y - opts.height/2);
+  ctx.bezierCurveTo(opts.x - opts.width/2, opts.y - opts.height/2, opts.x, opts.y - opts.height, opts.x + opts.width/2, opts.y - opts.height/2);
+  ctx.bezierCurveTo(opts.x + opts.width/2, opts.y - opts.height/2, opts.x + opts.width/2, opts.y + opts.height/2, opts.x, opts.y + opts.height/2);
+  ctx.bezierCurveTo(opts.x, opts.y + opts.height/2, opts.x - opts.width/2, opts.y + opts.height/2, opts.x - opts.width/2, opts.y - opts.height/2);
+  ctx.fillStyle = "black";
+  ctx.fill();
+  ctx.stroke();
+}
+
+function renderMouth(ctx, opts) {
+  ctx.strokeStyle = "black";
+  ctx.lineWidth = 2;
+  ctx.beginPath();
+  switch (opts.style) {
+    case "smirk":
+      ctx.moveTo(opts.x - opts.width/2, opts.y - opts.height/2);
+      ctx.bezierCurveTo(opts.x - opts.width/2, opts.y - opts.height/2,
+        opts.x - opts.width/2, opts.y + opts.height/2,
+        opts.x + opts.width/2, opts.y
+      )
+      break;
+    case "cat":
+      ctx.moveTo(opts.x - opts.width/2, opts.y + opts.height/2);
+      ctx.lineTo(opts.x, opts.y - opts.height/2);
+      ctx.lineTo(opts.x + opts.width/2, opts.y + opts.height/2);
+      break;
+  }
+  ctx.stroke();
+}
+
+function drawEllipseByCenter(ctx, cx, cy, w, h, color, fillColor, kappa) {
+  drawEllipse(ctx, cx - w/2.0, cy - h/2.0, w, h, color, fillColor, kappa);
+}
+
+function drawEllipse(ctx, x, y, w, h, color, fillColor, kappa) {
+  var kappa = kappa || 0.3,
+      ox = (w / 2) * kappa, // control point offset horizontal
+      oy = (h / 2) * kappa, // control point offset vertical
+      xe = x + w,           // x-end
+      ye = y + h,           // y-end
+      xm = x + w / 2,       // x-middle
+      ym = y + h / 2;       // y-middle
+
+  if (color) {
+    ctx.strokeStyle = color;
+  }
+  ctx.beginPath();
+  ctx.moveTo(x, ym);
+  ctx.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
+  ctx.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
+  ctx.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
+  ctx.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
+  var fillColor = fillColor || color;
+  if (fillColor) {
+    ctx.fillStyle = fillColor;
+    ctx.fill();
+  }
+  ctx.stroke();
+}
+
+module.exports = renderFox;