canvas之自定义头像功能实现代码示例

function mousemoveFunc(event) {
/* Act on the event */
var nowMouseX = event.clientX - clearCanvasObj.left;
var nowMouseY = event.clientY - clearCanvasObj.top;
if (nowMouseX >= clearCanvasObj.xStart && nowMouseX <= clearCanvasObj.xStart + clearCanvasObj.width && nowMouseY >= clearCanvasObj.yStart && nowMouseY <= clearCanvasObj.yStart + clearCanvasObj.height) {
clearCanvasObj.isCanvasArea = true;
//clearCanvasObj.isRightCorner = false;
imgContainerCanvas.style.cursor = 'move';
} else if ((nowMouseX >= clearCanvasObj.xStart + clearCanvasObj.width - 10) && (nowMouseX <= clearCanvasObj.xStart+ clearCanvasObj.width + 10)
&& (nowMouseY >= clearCanvasObj.yStart + clearCanvasObj.height - 10) && (nowMouseY <= clearCanvasObj.yStart + clearCanvasObj.height + 10)) {
clearCanvasObj.isCanvasArea = true;
//clearCanvasObj.beginDraw = false;
 imgContainerCanvas.style.cursor = 'se-resize';
}
else {
clearCanvasObj.isCanvasArea = false;
//clearCanvasObj.isRightCorner = false;
imgContainerCanvas.style.cursor = 'default';
}
var outerDomWidth = $(".imgContainer").width();
var outerDomHeight = $(".imgContainer").height();
var xDistance = event.clientX - clearCanvasObj.mouseX;
var yDistance = event.clientY - clearCanvasObj.mouseY;
//var outerCTX = canvas.getContext('2d');
//移动小方框
if (clearCanvasObj.beginDraw && clearCanvasObj.isCanvasArea && !clearCanvasObj.isRightCorner) {
ry_CTX.fillStyle = clearCanvasObj.color;
// console.log('1', clearCanvasObj.xStart, clearCanvasObj.yStart)
ry_CTX.fillRect(clearCanvasObj.xStart, clearCanvasObj.yStart, clearCanvasObj.width, clearCanvasObj.height);
//outerCTX.fillRect(0, 0, canvas.width, canvas.height);
clearCanvasObj.xStart += xDistance;
clearCanvasObj.yStart += yDistance;
 //判断方框是否达到边界
if (clearCanvasObj.xStart <= 0) {
clearCanvasObj.xStart = 0;
}
if (clearCanvasObj.yStart <= 0) {
clearCanvasObj.yStart = 0;
}
if ((clearCanvasObj.xStart + clearCanvasObj.width) >= outerDomWidth) {
clearCanvasObj.xStart = outerDomWidth - clearCanvasObj.width;
}
if ((clearCanvasObj.yStart + clearCanvasObj.height) >= outerDomHeight) {
clearCanvasObj.yStart = outerDomHeight - clearCanvasObj.height;
}
// console.log('2', clearCanvasObj.xStart, clearCanvasObj.yStart)
ry_CTX.clearRect(clearCanvasObj.xStart, clearCanvasObj.yStart, clearCanvasObj.width, clearCanvasObj.height);
produceSmallPic(clearCanvasObj.xStart+clearCanvasObj.left, clearCanvasObj.yStart+clearCanvasObj.top, clearCanvasObj.width, clearCanvasObj.height, imageURL)
clearCanvasObj.mouseX = event.clientX;
clearCanvasObj.mouseY = event.clientY;
}
//拖拽小方框
if (clearCanvasObj.isRightCorner) {
ry_CTX.fillStyle = clearCanvasObj.color;								 
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