質問編集履歴
2
初心者マークつけました
test
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test
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1
指摘を入れていただきましたので修正しました
test
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test
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@@ -2,14 +2,70 @@
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5
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ソースコードはこれです
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6
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7
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9
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var canvas = document.getElementById("myCanvas");
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10
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11
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var ctx = canvas.getContext("2d");
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12
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13
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var ballRadius = 10;
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14
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15
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var x = canvas.width/2;
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var y = canvas.height-30;
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var dx = 2;
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20
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var dy = -2;
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8
22
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25
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function drawBall() {
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ctx.beginPath();
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28
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11
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-
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29
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ctx.arc(x, y, ballRadius, 0, Math.PI*2);
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ctx.fillStyle = "#0095DD";
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32
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ctx.fill();
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34
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35
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ctx.closePath();
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36
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}
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38
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function draw() {
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42
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15
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-
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43
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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44
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45
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drawBall();
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46
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47
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48
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49
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if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
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50
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51
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dx = -dx;
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52
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53
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}
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54
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55
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if(y + dy > canvas.height-ballRadius || y + dy < ballRadius) {
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56
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57
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dy = -dy;
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58
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59
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}
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60
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61
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62
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63
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x += dx;
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64
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65
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y += dy;
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66
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67
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}
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68
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69
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70
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71
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setInterval(draw, 10);
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