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html5 canvas旋转

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-…

canvas旋转文本

canvas旋转文本 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatibl…

canvas旋转图片

canvas旋转图片 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatibl…

Canvas旋转元素

Canvas是HTML5的画布元素,有时需要按指定角度旋转某一个元素. var canvas = document.getElementById("mycanvas"); var ctx = canvas.getContext("2d"); //x,y为旋转的圆心,theta为角度(弧度,范围0~2π) ctx.translate(x, y); ctx.rotate(theta); ctx.translate(-x, -y); //绘制元素 ...…

Canvas旋转图片--保持相同大小的算法

 function drawImg(angle) {     canvas.width = canvas.width; var distance = size / 2 * Math.sqrt(2) * Math.sin(angle * Math.PI / 180 / 2) * 2;     var degree = 180 - 45 - (180 - angle) / 2;     var x = distance * Math.sin(degree * Math.PI / 180);    …

Canvas 旋转风车绘制

写在前面:   亲爱的朋友们大家好,鄙人自学前端,第一次写博客,写的不好的地方,烦请同学们谅解,如果本文对你有一丁点帮助,还请劳驾您给我点个赞,您的认可将是我坚持下去的强大动力!谢谢! 在进行教学之前,我想聪明的你已经掌握了基本的Canvas基本操作方法,如果对Canvas还不是很了解,那么我建议你去http://www.w3school.com.cn/tags/html_ref_canvas.asp这里先熟悉一下: okey!下图即是我们完成后的简单效果,心动不如行动,那么咱们就进行简单绘制吧…

html5 canvas旋转+缩放

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-…

html5 canvas 旋转扩大

<!doctype html> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> <script> window.onload = function () { var oC = document.getElementById('c1'); var oGC = oC.getContext('2d'); var num = 0; var in…

Canvas 旋转的图片

var image = new Image(), counter = 0; image.onload = function () { var CANVAS_WIDTH = 300, CANVAS_HEIGHT = 300; var canvas = $("#canvas").css({width:CANVAS_WIDTH, height:CANVAS_HEIGHT}) .attr({width:CANVAS_WIDTH, height:CANVAS_HEIGHT}).get(0), _…

canvas 旋转

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"></head><body> <canvas id="myCanvas" style="border:1px solid red" width="300" height="300"><…