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我对canvas fillText函数有问题。我有这样的代码:如何将文本添加到画布中
scene.shapes['shop1'] = new Shape();
var ps1 = scene.shapes['shop1'].points; // for convenience
ps1[0] = new Point(1024, 66, 10); // left bottom
ps1[1] = new Point(694, 66, 10); // right bottom
ps1[2] = new Point(694, 466, 10); // right top
ps1[3] = new Point(1024, 466, 10); // left top
// Background
scene.shapes['shop1'].polygons.push(new Polygon(
[ps1[0], ps1[1], ps1[2], ps1[3] ],
new Point(0, 0, 1),
true /* double-sided */,
Polygon.SOLID,
[177, 216, 249]
));
scene.shapes['shop1Header'] = new Shape();
var ps1h = scene.shapes['shop1Header'].points; // for convenience
ps1h[0] = new Point(1024, 400, 11); // left bottom
ps1h[1] = new Point(694, 400, 11); // right bottom
ps1h[2] = new Point(694, 466, 11); // right top
ps1h[3] = new Point(1024, 466, 11); // left top
// Background
scene.shapes['shop1Header'].polygons.push(new Polygon(
[ps1h[0], ps1h[1], ps1h[2], ps1h[3] ],
new Point(0, 0, 1),
true /* double-sided */,
Polygon.SOLID,
[175, 175, 175]
));
var x = -1024;
var y = -500;
ctx.font = '60pt Calibri';
ctx.lineWidth = 3;
// fill color
ctx.fillStyle = 'blue';
ctx.fillText('Hello World!', x, y);
但它不创建文本,只显示商店。你知道吗,如何解决这个问题?非常感谢你。
这个负值不是问题,因为我有摄像机z positoin = 2048,它必须显示。我试图改变为O,O但仍然没有。 – user1870556
对不起。我纠正了我的答案。 2d画布上没有z位置。你如何分配ctx? – ZippyV
这里http://pastebin.com/56GFR2Vi完成代码。 我如何分配ctx: canvas = document.getElementById(“cv”); ctx = canvas.getContext(“2d”); 并且存在z位置的相机定位: scene.camera.x = 0; scene.camera.y = 0; scene.camera.z = 2048; – user1870556