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authort7yang <t7yang@gmail.com>2021-06-22 23:06:54 +0800
committerIrvin <irvinfly@gmail.com>2021-06-23 01:24:08 +0800
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diff --git a/files/zh-tw/web/api/canvas_api/tutorial/compositing/example/index.html b/files/zh-tw/web/api/canvas_api/tutorial/compositing/example/index.html
new file mode 100644
index 0000000000..af2ccc0796
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+++ b/files/zh-tw/web/api/canvas_api/tutorial/compositing/example/index.html
@@ -0,0 +1,294 @@
+---
+title: Compositing example
+slug: Web/API/Canvas_API/Tutorial/Compositing/Example
+tags:
+ - Canvas
+ - Example
+ - Graphics
+ - HTML
+ - HTML5
+ - Tutorial
+---
+<div>{{CanvasSidebar}}</div>
+
+<p>This sample program demonstrates a number of <a href="/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation">compositing operations</a>. The output looks like this:</p>
+
+<p>{{EmbedLiveSample("Compositing_example", "100%", 7250)}}</p>
+
+<h2 id="Compositing_example">Compositing example</h2>
+
+<p>This code sets up the global values used by the rest of the program.</p>
+
+<pre class="brush: js">var canvas1 = document.createElement("canvas");
+var canvas2 = document.createElement("canvas");
+var gco = [ 'source-over','source-in','source-out','source-atop',
+            'destination-over','destination-in','destination-out','destination-atop',
+            'lighter', 'copy','xor', 'multiply', 'screen', 'overlay', 'darken',
+            'lighten', 'color-dodge', 'color-burn', 'hard-light', 'soft-light',
+            'difference', 'exclusion', 'hue', 'saturation', 'color', 'luminosity'
+          ].reverse();
+var gcoText = [
+'This is the default setting and draws new shapes on top of the existing canvas content.',
+'The new shape is drawn only where both the new shape and the destination canvas overlap. Everything else is made transparent.',
+'The new shape is drawn where it doesn\'t overlap the existing canvas content.',
+'The new shape is only drawn where it overlaps the existing canvas content.',
+'New shapes are drawn behind the existing canvas content.',
+'The existing canvas content is kept where both the new shape and existing canvas content overlap. Everything else is made transparent.',
+'The existing content is kept where it doesn\'t overlap the new shape.',
+'The existing canvas is only kept where it overlaps the new shape. The new shape is drawn behind the canvas content.',
+'Where both shapes overlap the color is determined by adding color values.',
+'Only the new shape is shown.',
+'Shapes are made transparent where both overlap and drawn normal everywhere else.',
+'The pixels of the top layer are multiplied with the corresponding pixel of the bottom layer. A darker picture is the result.',
+'The pixels are inverted, multiplied, and inverted again. A lighter picture is the result (opposite of multiply)',
+'A combination of multiply and screen. Dark parts on the base layer become darker, and light parts become lighter.',
+'Retains the darkest pixels of both layers.',
+'Retains the lightest pixels of both layers.',
+'Divides the bottom layer by the inverted top layer.',
+'Divides the inverted bottom layer by the top layer, and then inverts the result.',
+'A combination of multiply and screen like overlay, but with top and bottom layer swapped.',
+'A softer version of hard-light. Pure black or white does not result in pure black or white.',
+'Subtracts the bottom layer from the top layer or the other way round to always get a positive value.',
+'Like difference, but with lower contrast.',
+'Preserves the luma and chroma of the bottom layer, while adopting the hue of the top layer.',
+'Preserves the luma and hue of the bottom layer, while adopting the chroma of the top layer.',
+'Preserves the luma of the bottom layer, while adopting the hue and chroma of the top layer.',
+'Preserves the hue and chroma of the bottom layer, while adopting the luma of the top layer.'
+          ].reverse();
+var width = 320;
+var height = 340;
+</pre>
+
+<h3 id="Main_program">Main program</h3>
+
+<p>When the page loads, this code runs to set up and run the example:</p>
+
+<pre class="brush: js">window.onload = function() {
+    // lum in sRGB
+    var lum = {
+        r: 0.33,
+        g: 0.33,
+        b: 0.33
+    };
+    // resize canvas
+    canvas1.width = width;
+    canvas1.height = height;
+    canvas2.width = width;
+    canvas2.height = height;
+    lightMix()
+    colorSphere();
+    runComposite();
+    return;
+};
+</pre>
+
+<p>And this code, <code>runComposite()</code>, handles the bulk of the work, relying on a number of utility functions to do the hard parts.</p>
+
+<pre class="brush: js">function createCanvas() {
+    var canvas = document.createElement("canvas");
+    canvas.style.background = "url("+op_8x8.data+")";
+    canvas.style.border = "1px solid #000";
+    canvas.style.margin = "5px";
+    canvas.width = width/2;
+    canvas.height = height/2;
+  return canvas;
+}
+
+function runComposite() {
+    var dl = document.createElement("dl");
+    document.body.appendChild(dl);
+    while(gco.length) {
+        var pop = gco.pop();
+        var dt = document.createElement("dt");
+        dt.textContent = pop;
+        dl.appendChild(dt);
+        var dd = document.createElement("dd");
+        var p = document.createElement("p");
+        p.textContent = gcoText.pop();
+        dd.appendChild(p);
+
+  var canvasToDrawOn = createCanvas();
+   var canvasToDrawFrom = createCanvas();
+   var canvasToDrawResult = createCanvas();
+
+        var ctx = canvasToDrawResult.getContext('2d');
+        ctx.clearRect(0, 0, width, height)
+        ctx.save();
+        ctx.drawImage(canvas1, 0, 0, width/2, height/2);
+        ctx.globalCompositeOperation = pop;
+        ctx.drawImage(canvas2, 0, 0, width/2, height/2);
+        ctx.globalCompositeOperation = "source-over";
+        ctx.fillStyle = "rgba(0,0,0,0.8)";
+        ctx.fillRect(0, height/2 - 20, width/2, 20);
+        ctx.fillStyle = "#FFF";
+        ctx.font = "14px arial";
+        ctx.fillText(pop, 5, height/2 - 5);
+        ctx.restore();
+
+        var ctx = canvasToDrawOn.getContext('2d');
+        ctx.clearRect(0, 0, width, height)
+        ctx.save();
+        ctx.drawImage(canvas1, 0, 0, width/2, height/2);
+        ctx.fillStyle = "rgba(0,0,0,0.8)";
+        ctx.fillRect(0, height/2 - 20, width/2, 20);
+        ctx.fillStyle = "#FFF";
+        ctx.font = "14px arial";
+        ctx.fillText('existing content', 5, height/2 - 5);
+        ctx.restore();
+
+        var ctx = canvasToDrawFrom.getContext('2d');
+        ctx.clearRect(0, 0, width, height)
+        ctx.save();
+        ctx.drawImage(canvas2, 0, 0, width/2, height/2);
+        ctx.fillStyle = "rgba(0,0,0,0.8)";
+        ctx.fillRect(0, height/2 - 20, width/2, 20);
+        ctx.fillStyle = "#FFF";
+        ctx.font = "14px arial";
+        ctx.fillText('new content', 5, height/2 - 5);
+        ctx.restore();
+
+        dd.appendChild(canvasToDrawOn);
+        dd.appendChild(canvasToDrawFrom);
+        dd.appendChild(canvasToDrawResult);
+
+        dl.appendChild(dd);
+    }
+};
+</pre>
+
+<h3 id="Utility_functions">Utility functions</h3>
+
+<p>The program relies on a number of utility functions.</p>
+
+<pre class="brush: js">var lightMix = function() {
+    var ctx = canvas2.getContext("2d");
+    ctx.save();
+    ctx.globalCompositeOperation = "lighter";
+    ctx.beginPath();
+    ctx.fillStyle = "rgba(255,0,0,1)";
+    ctx.arc(100, 200, 100, Math.PI*2, 0, false);
+    ctx.fill()
+    ctx.beginPath();
+    ctx.fillStyle = "rgba(0,0,255,1)";
+    ctx.arc(220, 200, 100, Math.PI*2, 0, false);
+    ctx.fill()
+    ctx.beginPath();
+    ctx.fillStyle = "rgba(0,255,0,1)";
+    ctx.arc(160, 100, 100, Math.PI*2, 0, false);
+    ctx.fill();
+    ctx.restore();
+    ctx.beginPath();
+    ctx.fillStyle = "#f00";
+    ctx.fillRect(0,0,30,30)
+    ctx.fill();
+};
+</pre>
+
+<pre class="brush: js">var colorSphere = function(element) {
+    var ctx = canvas1.getContext("2d");
+    var width = 360;
+    var halfWidth = width / 2;
+    var rotate = (1 / 360) * Math.PI * 2; // per degree
+    var offset = 0; // scrollbar offset
+    var oleft = -20;
+    var otop = -20;
+    for (var n = 0; n &lt;= 359; n ++) {
+        var gradient = ctx.createLinearGradient(oleft + halfWidth, otop, oleft + halfWidth, otop + halfWidth);
+        var color = Color.HSV_RGB({ H: (n + 300) % 360, S: 100, V: 100 });
+        gradient.addColorStop(0, "rgba(0,0,0,0)");
+        gradient.addColorStop(0.7, "rgba("+color.R+","+color.G+","+color.B+",1)");
+        gradient.addColorStop(1, "rgba(255,255,255,1)");
+        ctx.beginPath();
+        ctx.moveTo(oleft + halfWidth, otop);
+        ctx.lineTo(oleft + halfWidth, otop + halfWidth);
+        ctx.lineTo(oleft + halfWidth + 6, otop);
+        ctx.fillStyle = gradient;
+        ctx.fill();
+        ctx.translate(oleft + halfWidth, otop + halfWidth);
+        ctx.rotate(rotate);
+        ctx.translate(-(oleft + halfWidth), -(otop + halfWidth));
+    }
+    ctx.beginPath();
+    ctx.fillStyle = "#00f";
+    ctx.fillRect(15,15,30,30)
+    ctx.fill();
+    return ctx.canvas;
+};
+</pre>
+
+<pre class="brush: js">// HSV (1978) = H: Hue / S: Saturation / V: Value
+Color = {};
+Color.HSV_RGB = function (o) {
+    var H = o.H / 360,
+        S = o.S / 100,
+        V = o.V / 100,
+        R, G, B;
+    var A, B, C, D;
+    if (S == 0) {
+        R = G = B = Math.round(V * 255);
+    } else {
+        if (H &gt;= 1) H = 0;
+        H = 6 * H;
+        D = H - Math.floor(H);
+        A = Math.round(255 * V * (1 - S));
+        B = Math.round(255 * V * (1 - (S * D)));
+        C = Math.round(255 * V * (1 - (S * (1 - D))));
+        V = Math.round(255 * V);
+        switch (Math.floor(H)) {
+            case 0:
+                R = V;
+                G = C;
+                B = A;
+                break;
+            case 1:
+                R = B;
+                G = V;
+                B = A;
+                break;
+            case 2:
+                R = A;
+                G = V;
+                B = C;
+                break;
+            case 3:
+                R = A;
+                G = B;
+                B = V;
+                break;
+            case 4:
+                R = C;
+                G = A;
+                B = V;
+                break;
+            case 5:
+                R = V;
+                G = A;
+                B = B;
+                break;
+        }
+    }
+    return {
+        R: R,
+        G: G,
+        B: B
+    };
+};
+
+var createInterlace = function (size, color1, color2) {
+    var proto = document.createElement("canvas").getContext("2d");
+    proto.canvas.width = size * 2;
+    proto.canvas.height = size * 2;
+    proto.fillStyle = color1; // top-left
+    proto.fillRect(0, 0, size, size);
+    proto.fillStyle = color2; // top-right
+    proto.fillRect(size, 0, size, size);
+    proto.fillStyle = color2; // bottom-left
+    proto.fillRect(0, size, size, size);
+    proto.fillStyle = color1; // bottom-right
+    proto.fillRect(size, size, size, size);
+    var pattern = proto.createPattern(proto.canvas, "repeat");
+    pattern.data = proto.canvas.toDataURL();
+    return pattern;
+};
+
+var op_8x8 = createInterlace(8, "#FFF", "#eee");</pre>
diff --git a/files/zh-tw/web/api/canvas_api/tutorial/compositing/index.html b/files/zh-tw/web/api/canvas_api/tutorial/compositing/index.html
index e5453c93a5..1cdf1d3f15 100644
--- a/files/zh-tw/web/api/canvas_api/tutorial/compositing/index.html
+++ b/files/zh-tw/web/api/canvas_api/tutorial/compositing/index.html
@@ -123,9 +123,13 @@ translation_of: Web/API/Canvas_API/Tutorial/Compositing
<p>這裡有這些構圖組合的<a href="/en-US/docs/Web/Guide/HTML/Canvas_tutorial/Compositing/Example" title="/en-US/docs/Web/Guide/HTML/Canvas_tutorial/Compositing/Example">實際範例</a>,<a href="https://mdn.mozillademos.org/en-US/docs/Web/Guide/HTML/Canvas_tutorial/Compositing/Example$samples/Compositing_example" title="https://mdn.mozillademos.org/en-US/docs/Web/Guide/HTML/Canvas_tutorial/Compositing/Example$samples/Compositing_example">輸出結果</a>在此。</p>
+<p>See <a href="/zh-TW/docs/Web/API/Canvas_API/Tutorial/Compositing/Example">compositing examples</a> for the code of the following examples.</p>
+
+<p>{{EmbedLiveSample("Compositing_example", 750, 6750, "" ,"Web/API/Canvas_API/Tutorial/Compositing/Example")}}</p>
+
<h2 id="Clipping_paths" name="Clipping_paths">裁剪路徑</h2>
-<p><img alt="" class="internal" src="https://mdn.mozillademos.org/files/209/Canvas_clipping_path.png" style="float: right;">裁剪路徑就像是一般畫布圖形繪圖,但就如同遮罩一樣,會蓋掉不需要的部分,如右圖所示。紅邊星星是我們的裁剪路徑,在路徑區域以外部分都不會出現在畫布上。</p>
+<p><img alt="" class="internal" src="canvas_clipping_path.png" style="float: right;">裁剪路徑就像是一般畫布圖形繪圖,但就如同遮罩一樣,會蓋掉不需要的部分,如右圖所示。紅邊星星是我們的裁剪路徑,在路徑區域以外部分都不會出現在畫布上。</p>
<p>和上述 globalCompositeOperation 相比,可以發現 source-in 和 source-atop 這兩種構圖組合所達到的效果,和裁剪路徑類似,而其中最大差異在於裁剪路徑不需加入新圖形,消失的部分也不會出現在畫布上,所以,如果想要限定繪圖區域,裁剪路徑會是更理想的作法。</p>
@@ -202,6 +206,6 @@ function drawStar(ctx,r){
<p>繪製裁剪路徑之後,所產生的所有圖形都只會出現在路徑以內,從後來繪製的漸層背景中可看出此特性。我們用自訂的 drawStar() 函數產生 50 個隨機散佈、大小不一的星星。這些星星同樣只會出現在裁剪路徑的範圍之內。</p>
-<p>{{EmbedLiveSample("A_clip_example", "180", "180", "https://mdn.mozillademos.org/files/208/Canvas_clip.png")}}</p>
+<p>{{EmbedLiveSample("A_clip_example", "180", "180", "canvas_clip.png")}}</p>
<p>{{PreviousNext("Web/Guide/HTML/Canvas_tutorial/Transformations", "Web/Guide/HTML/Canvas_tutorial/Basic_animations")}}</p>