unslug ja: move

1 files changed, 380 insertions, 0 deletions

diff --git a/files/ja/web/api/canvas_api/tutorial/advanced_animations/index.html b/files/ja/web/api/canvas_api/tutorial/advanced_animations/index.html
new file mode 100644
index 0000000000..d8cf43a362
--- /dev/null
+++ b/files/ja/web/api/canvas_api/tutorial/advanced_animations/index.html
@@ -0,0 +1,380 @@
+---
+title: 高度なアニメーション
+slug: Web/Guide/HTML/Canvas_tutorial/Advanced_animations
+tags:
+  - Canvas
+  - Graphics
+  - Tutorial
+translation_of: Web/API/Canvas_API/Tutorial/Advanced_animations
+---
+<div>{{CanvasSidebar}} {{PreviousNext("Web/API/Canvas_API/Tutorial/Basic_animations", "Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas")}}</div>
+
+<div class="summary">
+<p>前の章では、いくつかの<a href="/en-US/docs/Web/API/Canvas_API/Tutorial/Basic_animations">基本的なアニメーション</a>を作成して、物の動かし方を学びました。このパートでは、 運動そのものをより詳細に見て、 アニメーションをより高度にするための物理を追加していきましょう。</p>
+</div>
+
+<h2 id="ボールを描く">ボールを描く</h2>
+
+<p>アニメーションの勉強のために、ボールを使おうと思うので、最初にボールを canvas 上に描きましょう。次のコードは私たちの準備をしてくれるでしょう。</p>
+
+<pre class="notranslate">&lt;canvas id="canvas" width="600" height="300"&gt;&lt;/canvas&gt;
+</pre>
+
+<p>普通は、まず描画コンテキストが必要になります。 ボールを描くため、 <code>プロパティと canvas にボールを描くための draw() </code>メソッドを持つ ball オブジェクトを作りましょう。</p>
+
+<pre class="brush: js notranslate">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+
+var ball = {
+  x: 100,
+  y: 100,
+  radius: 25,
+  color: 'blue',
+  draw: function() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true);
+    ctx.closePath();
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+};
+
+ball.draw();</pre>
+
+<p>ここでは特別なことはなく、ball は本当に単純な円で、{{domxref("CanvasRenderingContext2D.arc()", "arc()")}} メソッドの助けを借りて描かれています。</p>
+
+<h2 id="速度の追加">速度の追加</h2>
+
+<p>ボールが手に入りましたので、このチュートリアルの<a href="/en-US/docs/Web/API/Canvas_API/Tutorial/Basic_animations">前の章</a>で習ったように、基本的なアニメーションを加えていきましょう。また {{domxref("window.requestAnimationFrame()")}} がアニメーションの制御を手助けしてくれます。The ball gets moving by adding a velocity vector to the position. For each frame, we also {{domxref("CanvasRenderingContext2D.clearRect", "clear", "", 1)}} the canvas to remove old circles from prior frames.</p>
+
+<pre class="brush: js; highlight:[8,9,24,25] notranslate">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+var raf;
+
+var ball = {
+  x: 100,
+  y: 100,
+  vx: 5,
+  vy: 2,
+  radius: 25,
+  color: 'blue',
+  draw: function() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true);
+    ctx.closePath();
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+};
+
+function draw() {
+  ctx.clearRect(0,0, canvas.width, canvas.height);
+  ball.draw();
+  ball.x += ball.vx;
+  ball.y += ball.vy;
+  raf = window.requestAnimationFrame(draw);
+}
+
+canvas.addEventListener('mouseover', function(e){
+  raf = window.requestAnimationFrame(draw);
+});
+
+canvas.addEventListener("mouseout",function(e){
+  window.cancelAnimationFrame(raf);
+});
+
+ball.draw();
+</pre>
+
+<h2 id="境界線">境界線</h2>
+
+<p>Without any boundary collision testing our ball runs out of the canvas quickly. We need to check if the <code>x</code> and <code>y</code> position of the ball is out of the canvas dimensions and invert the direction of the velocity vectors. To do so, we add the following checks to the <code>draw</code> method:</p>
+
+<pre class="brush: js notranslate">if (ball.y + ball.vy &gt; canvas.height || ball.y + ball.vy &lt; 0) {
+  ball.vy = -ball.vy;
+}
+if (ball.x + ball.vx &gt; canvas.width || ball.x + ball.vx &lt; 0) {
+  ball.vx = -ball.vx;
+}</pre>
+
+<h3 id="最初のデモ">最初のデモ</h3>
+
+<p>これまでで、実際にどのように動くか見てみましょう。canvas にマウスを移動させて、アニメーションを開始してます。</p>
+
+<div class="hidden">
+<pre class="brush: html notranslate">&lt;canvas id="canvas" style="border: 1px solid" width="600" height="300"&gt;&lt;/canvas&gt;</pre>
+
+<pre class="brush: js notranslate">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+var raf;
+
+var ball = {
+  x: 100,
+  y: 100,
+  vx: 5,
+  vy: 2,
+  radius: 25,
+  color: 'blue',
+  draw: function() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true);
+    ctx.closePath();
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+};
+
+function draw() {
+  ctx.clearRect(0,0, canvas.width, canvas.height);
+  ball.draw();
+  ball.x += ball.vx;
+  ball.y += ball.vy;
+
+  if (ball.y + ball.vy &gt; canvas.height ||
+      ball.y + ball.vy &lt; 0) {
+    ball.vy = -ball.vy;
+  }
+  if (ball.x + ball.vx &gt; canvas.width ||
+      ball.x + ball.vx &lt; 0) {
+    ball.vx = -ball.vx;
+  }
+
+  raf = window.requestAnimationFrame(draw);
+}
+
+canvas.addEventListener('mouseover', function(e){
+  raf = window.requestAnimationFrame(draw);
+});
+
+canvas.addEventListener("mouseout",function(e){
+  window.cancelAnimationFrame(raf);
+});
+
+ball.draw();</pre>
+</div>
+
+<p>{{EmbedLiveSample("First_demo", "610", "310")}}</p>
+
+<h2 id="加速">加速</h2>
+
+<p>動きをよりリアルにするために、このような速度で再生できます。たとえば：</p>
+
+<pre class="brush: js notranslate">ball.vy *= .99;
+ball.vy += .25;</pre>
+
+<p>This slows down the vertical velocity each frame, so that the ball will just bounce on the floor in the end.</p>
+
+<div class="hidden">
+<h6 id="Second_demo">Second demo</h6>
+
+<pre class="brush: html notranslate">&lt;canvas id="canvas" style="border: 1px solid" width="600" height="300"&gt;&lt;/canvas&gt;</pre>
+
+<pre class="brush: js notranslate">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+var raf;
+
+var ball = {
+  x: 100,
+  y: 100,
+  vx: 5,
+  vy: 2,
+  radius: 25,
+  color: 'blue',
+  draw: function() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true);
+    ctx.closePath();
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+};
+
+function draw() {
+  ctx.clearRect(0,0, canvas.width, canvas.height);
+  ball.draw();
+  ball.x += ball.vx;
+  ball.y += ball.vy;
+  ball.vy *= .99;
+  ball.vy += .25;
+
+  if (ball.y + ball.vy &gt; canvas.height ||
+      ball.y + ball.vy &lt; 0) {
+    ball.vy = -ball.vy;
+  }
+  if (ball.x + ball.vx &gt; canvas.width ||
+      ball.x + ball.vx &lt; 0) {
+    ball.vx = -ball.vx;
+  }
+
+  raf = window.requestAnimationFrame(draw);
+}
+
+canvas.addEventListener('mouseover', function(e){
+  raf = window.requestAnimationFrame(draw);
+});
+
+canvas.addEventListener("mouseout",function(e){
+  window.cancelAnimationFrame(raf);
+});
+
+ball.draw();</pre>
+</div>
+
+<p>{{EmbedLiveSample("Second_demo", "610", "310")}}</p>
+
+<h2 id="後引きの効果">後引きの効果</h2>
+
+<p>Until now we have made use of the {{domxref("CanvasRenderingContext2D.clearRect", "clearRect")}} method when clearing prior frames. If you replace this method with a semi-transparent {{domxref("CanvasRenderingContext2D.fillRect", "fillRect")}}, you can easily create a trailing effect.</p>
+
+<pre class="brush: js notranslate">ctx.fillStyle = 'rgba(255,255,255,0.3)';
+ctx.fillRect(0,0,canvas.width,canvas.height);</pre>
+
+<div class="hidden">
+<h6 id="Third_demo">Third demo</h6>
+
+<pre class="brush: html notranslate">&lt;canvas id="canvas" style="border: 1px solid" width="600" height="300"&gt;&lt;/canvas&gt;</pre>
+
+<pre class="brush: js notranslate">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+var raf;
+
+var ball = {
+  x: 100,
+  y: 100,
+  vx: 5,
+  vy: 2,
+  radius: 25,
+  color: 'blue',
+  draw: function() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true);
+    ctx.closePath();
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+};
+
+function draw() {
+  ctx.fillStyle = 'rgba(255,255,255,0.3)';
+  ctx.fillRect(0,0,canvas.width,canvas.height);
+  ball.draw();
+  ball.x += ball.vx;
+  ball.y += ball.vy;
+  ball.vy *= .99;
+  ball.vy += .25;
+
+  if (ball.y + ball.vy &gt; canvas.height ||
+      ball.y + ball.vy &lt; 0) {
+    ball.vy = -ball.vy;
+  }
+  if (ball.x + ball.vx &gt; canvas.width ||
+      ball.x + ball.vx &lt; 0) {
+    ball.vx = -ball.vx;
+  }
+
+  raf = window.requestAnimationFrame(draw);
+}
+
+canvas.addEventListener('mouseover', function(e){
+  raf = window.requestAnimationFrame(draw);
+});
+
+canvas.addEventListener("mouseout",function(e){
+  window.cancelAnimationFrame(raf);
+});
+
+ball.draw();</pre>
+</div>
+
+<p>{{EmbedLiveSample("Third_demo", "610", "310")}}</p>
+
+<h2 id="マウスコントロールの追加">マウスコントロールの追加</h2>
+
+<p>ボールに対するちょっとした制御をするために、たとえば <code><a href="/en-US/docs/Web/Reference/Events/mousemove">mousemove</a></code> イベントを使用してボールをマウスの動きに従わせる。といったことができます。<code><a href="/en-US/docs/Web/Events/click">click </a></code>イベントでボールを開放して、またバウンドさせる。といったことも可能です。</p>
+
+<div class="hidden">
+<pre class="brush: html notranslate">&lt;canvas id="canvas" style="border: 1px solid" width="600" height="300"&gt;&lt;/canvas&gt;</pre>
+</div>
+
+<pre class="brush: js notranslate">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+var raf;
+var running = false;
+
+var ball = {
+  x: 100,
+  y: 100,
+  vx: 5,
+  vy: 1,
+  radius: 25,
+  color: 'blue',
+  draw: function() {
+    ctx.beginPath();
+    ctx.arc(this.x, this.y, this.radius, 0, Math.PI*2, true);
+    ctx.closePath();
+    ctx.fillStyle = this.color;
+    ctx.fill();
+  }
+};
+
+function clear() {
+  ctx.fillStyle = 'rgba(255,255,255,0.3)';
+  ctx.fillRect(0,0,canvas.width,canvas.height);
+}
+
+function draw() {
+  clear();
+  ball.draw();
+  ball.x += ball.vx;
+  ball.y += ball.vy;
+
+  if (ball.y + ball.vy &gt; canvas.height || ball.y + ball.vy &lt; 0) {
+    ball.vy = -ball.vy;
+  }
+  if (ball.x + ball.vx &gt; canvas.width || ball.x + ball.vx &lt; 0) {
+    ball.vx = -ball.vx;
+  }
+
+  raf = window.requestAnimationFrame(draw);
+}
+
+canvas.addEventListener('mousemove', function(e){
+  if (!running) {
+    clear();
+    ball.x = e.clientX;
+    ball.y = e.clientY;
+    ball.draw();
+  }
+});
+
+canvas.addEventListener("click",function(e){
+  if (!running) {
+    raf = window.requestAnimationFrame(draw);
+    running = true;
+  }
+});
+
+canvas.addEventListener("mouseout",function(e){
+  window.cancelAnimationFrame(raf);
+  running = false;
+});
+
+ball.draw();
+</pre>
+
+<p>マウスを使ってボールを動かして、クリックで開放してください。</p>
+
+<p>{{EmbedLiveSample("Adding_mouse_control", "610", "310")}}</p>
+
+<h2 id="ブロック崩し">ブロック崩し</h2>
+
+<p>This short chapter only explains some techniques to create more advanced animations. There are many more! How about adding a paddle, some bricks, and turn this demo into a <a href="http://en.wikipedia.org/wiki/Breakout_%28video_game%29">Breakout</a> game? Checkout our <a href="/en-US/docs/Games">Game development</a> area for more gaming related articles.</p>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li>{{domxref("window.requestAnimationFrame()")}}</li>
+ <li><a href="/en-US/docs/Games/Techniques/Efficient_animation_for_web_games">Efficient animation for web games</a></li>
+</ul>
+
+<p>{{PreviousNext("Web/API/Canvas_API/Tutorial/Basic_animations", "Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas")}}</p>