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canvas基础二

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");
                for (var i = 0; i < 6; i++) {
                    for (var j = 0; j < 6; j++) {
                        ctx.fillStyle = 'rgb(' + Math.floor(255 - 42.5 * i) + ',' +
                            Math.floor(255 - 42.5 * j) + ',0)';
                        ctx.fillRect(j * 50, i * 50, 50, 50);
                    }
                }
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");
                for (var i = 0; i < 6; i++) {
                    for (var j = 0; j < 6; j++) {
                        ctx.strokeStyle = 'rgb(' + Math.floor(255 - 42.5 * i) + ',' +
                            Math.floor(255 - 42.5 * j) + ',0)';
                        ctx.strokeRect(j * 50, i * 50, 40, 40);
                    }
                }
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");
                ctx.strokeStyle = '#ff0000';
                ctx.beginPath();
                ctx.moveTo(10, 10);
                ctx.lineTo(100, 10);
                ctx.lineWidth = 10;
                ctx.stroke();

                ctx.strokeStyle = '#ffff00';
                ctx.beginPath();
                ctx.moveTo(110, 10);
                ctx.lineTo(160, 10)
                ctx.lineWidth = 20;
                ctx.stroke()
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");
                var lineCaps = ["butt", "round", "square"];

                for (var i = 0; i < 3; i++) {
                    ctx.beginPath();
                    ctx.moveTo(20 + 30 * i, 30);
                    ctx.lineTo(20 + 30 * i, 100);
                    ctx.lineWidth = 20;
                    ctx.lineCap = lineCaps[i];
                    ctx.stroke();
                }

                ctx.beginPath();
                ctx.moveTo(0, 30);
                ctx.lineTo(300, 30);

                ctx.moveTo(0, 100);
                ctx.lineTo(300, 100)

                ctx.strokeStyle = "red";
                ctx.lineWidth = 1;
                ctx.stroke();
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");

                var lineJoin = ['round', 'bevel', 'miter'];
                ctx.lineWidth = 20;

                for (var i = 0; i < lineJoin.length; i++) {
                    ctx.lineJoin = lineJoin[i];
                    ctx.beginPath();
                    ctx.moveTo(50, 50 + i * 50);
                    ctx.lineTo(100, 100 + i * 50);
                    ctx.lineTo(150, 50 + i * 50);
                    ctx.lineTo(200, 100 + i * 50);
                    ctx.lineTo(250, 50 + i * 50);
                    ctx.stroke();
                }
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");

                ctx.setLineDash([20, 5]); // [实线长度, 间隙长度]
                ctx.lineDashOffset = -0;
                ctx.strokeRect(50, 50, 210, 210);
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");

                ctx.font = "50px sans-serif";
                ctx.fillText("徐同保", 10, 100);
                ctx.strokeText("xutongbao", 10, 200);
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

drawImage(image, x, y, width, height)

drawImage(image, sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight)

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>canvas</title>
</head>

<body>
    <canvas id="myCanvas" width="800" height="800" style="border:1px solid #d3d3d3;">
        您的浏览器不支持 HTML5 canvas 标签。</canvas>
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script>
    $(function() {
        var myAction = {},
            ctx;

        var dom = {
            canvas: $('#myCanvas')
        };

        $.extend(myAction, {
            initCanvas: function() {
                ctx = dom.canvas[0].getContext("2d");

                var img = new Image();   // 创建img元素
                img.onload = function(){
                  ctx.drawImage(img, 0, 0, 200, 120);
                  ctx.drawImage(img, 10, 10, 200, 120, 300, 0, 200, 120);
                }
                img.src = 'https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1537969303914&di=e0789df5029fc5d85b7c6acd18999e97&imgtype=0&src=http%3A%2F%2Fpic.58pic.com%2F58pic%2F17%2F27%2F14%2F86k58PICeMW_1024.jpg'; // 设置图片源地址
            }
        });

        var init = function() {
            myAction.initCanvas();
        }();
    })
    </script>
</body>

</html>

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原文地址：https://www.cnblogs.com/xutongbao/p/9924794.html