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我对JavaScript和画布很陌生，我有一个程序，它应该检测在椭圆路径上动画的元素。它后来去形成一棵树..但这是我连接到jsfiddle的基本结构。 它工作正常，没有缩放或平移，但只要我尝试缩放或平移，鼠标坐标就会失灵。 我尝试了以下markE的建议HTML5 canvas get coordinates after zoom and translate 但是我肯定是做错了事，我很清楚不了解画布和变换矩阵发生了什么。我花了大约3天试图改变这一切我能想到的组合，但我似乎无法推测出来：■缩放和平移画布后鼠标坐标不匹配
解决： 这里是我的代码以缩放和平移鼠标和动画和在椭圆检测元件： http://jsfiddle.net/metalloyd/A8hgz/
theCanvas = document.getElementById("canvasOne");
context = theCanvas.getContext("2d");
var status = document.getElementById('status');
var $canvas = $("#canvasOne");
var canvasOffset = $canvas.offset();
var offsetX = canvasOffset.left;
var offsetY = canvasOffset.top;
var scrollX = $canvas.scrollLeft();
var scrollY = $canvas.scrollTop();
var cw = theCanvas.width;
var ch = theCanvas.height;
var scaleFactor = 1.00;
var panX = 0;
var panY = 0;
var mainX = 250;
// setting the middle point position X value
var mainY = 100;
// setting the middle point position Y value
var mainR = 125;
// main ellipse radius R
var no = 5;
// number of nodes to display
var div_angle = 360/no;
var circle = {
centerX: mainX,
centerY: mainY + 100,
radius: mainR,
angle: .9
};
var ball = {
x: 0,
y: 0,
speed: .1
};
var a = 1.8;
//Ellipse width
var b = .5;
//Ellipse height
//Scale and Pan variables
var translatePos = {
x: 1,
y: 1
};
var startDragOffset = {};
var mouseDown = false;
var elements = [{}];
// Animate
var animateInterval = setInterval(drawScreen, 1);
//Animation
function drawScreen() {
context.clearRect(0, 0, cw, ch);
// Background box
context.beginPath();
context.fillStyle = '#EEEEEE';
context.fillRect(0, 0, theCanvas.width, theCanvas.height);
context.strokeRect(1, 1, theCanvas.width - 2, theCanvas.height - 2);
context.closePath();
context.save();
context.translate(panX, panY);
context.scale(scaleFactor, scaleFactor);
ball.speed = ball.speed + 0.001;
for (var i = 1; i <= no; i++) {
// male
new_angle = div_angle * i;
//Starting positions for ball 1 at different points on the ellipse
circle.angle = (new_angle * (0.0174532925)) + ball.speed;
//elliptical x position and y position for animation for the first ball
//xx and yy records the first balls coordinates
xx = ball.x = circle.centerX - (a * Math.cos(circle.angle)) * (circle.radius);
yy = ball.y = circle.centerY + (b * Math.sin(circle.angle)) * (circle.radius);
//Draw the first ball with position x and y
context.fillStyle = "#000000";
context.beginPath();
context.arc(ball.x, ball.y, 10, 0, Math.PI * 2, true);
context.fill();
context.closePath();
//alert("male Positions "+"X: "+ball.x+ " Y: "+ball.y);
// female
new_angle = div_angle * i + 4;
//Starting positions for ball 2 at different points on the ellipse
circle.angle = (new_angle * (0.0174532925)) + ball.speed;
//elliptical x position and y position for animation for the second ball
//ball.x and ball.y record the second balls positions
ball.x = circle.centerX - (a * Math.cos(circle.angle)) * (circle.radius);
ball.y = circle.centerY + (b * Math.sin(circle.angle)) * (circle.radius);
context.fillStyle = "#000000";
context.beginPath();
context.arc(ball.x, ball.y, 10, 0, Math.PI * 2, true);
context.fill();
context.closePath();
//alert("female Positions "+"X: "+ball.x+ " Y: "+ball.y);
//Record the ball positions in elements array for locating positions with mouse coordinates.
elements[i] = {
id: i,
femaleX: ball.x,
femaleY: ball.y,
maleX: xx,
maleY: yy,
w: 10 //radius of the ball to draw while locating the positions
};
//Text Numbering
context.beginPath();
context.fillStyle = "blue";
context.font = "bold 16px Arial";
context.fillText(elements[i].id, ball.x - 20, ball.y + 20);
context.closePath();
// line drawing--Connecting lines to the balls from the center.
context.moveTo(mainX, mainY);
context.lineTo((ball.x + xx)/2, (ball.y + yy)/2);
//Draw line till the middle point between ball1 and ball2
context.stroke();
context.fill();
context.closePath();
}
// center point
context.fillStyle = "#000000";
context.beginPath();
context.arc(mainX, mainY, 15, 0, Math.PI * 2, true);
context.fill();
context.closePath();
context.restore();
}
// Event Listeners
// Mouse move event to alert the position of the ball on screen
document.getElementById("plus").addEventListener("click", function() {
scaleFactor *= 1.1;
drawScreen();
}, false);
document.getElementById("minus").addEventListener("click", function() {
scaleFactor /= 1.1;
drawScreen();
}, false);
// Event listeners to handle screen panning
context.canvas.addEventListener("mousedown", function (evt) {
mouseDown = true;
startDragOffset.x = evt.clientX - translatePos.x;
startDragOffset.y = evt.clientY - translatePos.y;
});
context.canvas.addEventListener("mouseup", function (evt) {
mouseDown = false;
});
context.canvas.addEventListener("mouseover", function (evt) {
mouseDown = false;
});
context.canvas.addEventListener("mouseout", function (evt) {
mouseDown = false;
});
context.canvas.addEventListener("mousemove", function (evt) {
if (mouseDown) {
translatePos.x = evt.clientX - startDragOffset.x;
translatePos.y = evt.clientY - startDragOffset.y;
panX = translatePos.x;
panY = translatePos.y;
drawScreen();
}
evt.preventDefault();
evt.stopPropagation();
var mouseX = parseInt(evt.clientX - offsetX);
var mouseY = parseInt(evt.clientY - offsetY);
var mouseXT = parseInt((mouseX - panX)/scaleFactor);
var mouseYT = parseInt((mouseY - panY)/scaleFactor);
status.innerHTML = mouseXT + " | " + mouseYT;
for (var i = 1; i < elements.length; i++) {
var b = elements[i];
context.closePath();
context.beginPath();
context.arc(b.femaleX, b.femaleY, 10, 0, Math.PI * 2);
context.arc(b.maleX, b.maleY, 10, 0, Math.PI * 2);
if (context.isPointInPath(mouseXT, mouseYT)) {
theCanvas.style.cursor = 'pointer';
alert(b.id + " female.x: " + b.femaleX + " female.y: " + b.femaleY + " ball.x: " + ball.x + " ball.y: " + ball.y);
return;
} else theCanvas.style.cursor = 'default';
context.closePath();
}
});`
你代码变得太大了。首先要把它分解成小部分，你可以简单地进行单元测试。例如，有一个矩阵处理的单独部分，并检查它工作正常。编写一些小的绘图函数来简化（drawBackground，drawBall，...），并将你的事件处理从你的代码中解除关联（你的mousemove就像60行!!）。用小测试的积木，你很快就会看到捕获物的位置。 – GameAlchemist
哈哈！试图让它作为一个整体工作，我陷入了一段迷雾。但我确实将其分解为基础知识。它确实得到解决。谢谢你的建议:) 我真的不知道为什么我以前没有这么想过。 – MetalloyD
这是一个常见的错误，不会看到复杂性已经达到“关键”的门槛，不用担心。当我得到一个错误时，我总是怀疑它是否只是一个错误或我需要重构我的代码的标志。顺便说一下，我没有看到你发布的编辑有太多的变化，给一个重构的例子，我做了drawScreen（）的这个小提琴的重构（http://jsfiddle.net/gamealchemist/A8hgz/2/ – GameAlchemist