h5-6 canvas
2024-09-16 10:24:39
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d');
var yImg = new Image();
yImg.onload = function(){//图片加载完事件
draw(this);
};
yImg.src = '2.png';
function draw(obj){
oGC.drawImage(obj,0,0);
} }; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var aInput = document.getElementsByTagName('input');
var oImg = document.getElementById('img1');
var yImg = new Image();
var iNow = 0;
yImg.onload = function(){
draw(oImg);
};
yImg.src = oImg.src;
function draw(obj){
var oC = document.createElement('canvas');
var oGC = oC.getContext('2d');
oC.width = obj.width;
oC.height = obj.height;
obj.parentNode.replaceChild(oC,obj);
oGC.drawImage(obj,0,0);
aInput[1].onclick = function(){
if(iNow==3){
iNow = 0;
}
else{
iNow++;
}
toChange();
};
aInput[0].onclick = function(){
if(iNow==0){
iNow = 3;
}
else{
iNow--;
}
toChange();
};
function toChange(){
switch(iNow){
case 1:
oC.width = obj.height;
oC.height = obj.width;
oGC.rotate(90*Math.PI/180);
oGC.drawImage(obj,0,-obj.height);
break;
case 2:
oC.width = obj.width;
oC.height = obj.height;
oGC.rotate(180*Math.PI/180);//旋转
oGC.drawImage(obj,-obj.width,-obj.height);//移动图片的坐标
break;
case 3:
oC.width = obj.height;
oC.height = obj.width;
oGC.rotate(270*Math.PI/180);
oGC.drawImage(obj,-obj.width,0);
break;
case 0:
oC.width = obj.width;
oC.height = obj.height;
oGC.rotate(0);
oGC.drawImage(obj,0,0);
break;
}
}
}
}; </script>
</head> <body>
<input type="button" value="←" />
<input type="button" value="→" />
<div>
<img src="2.png" id="img1" />
</div>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d');
var yImg = new Image();
yImg.onload = function(){
draw(this);//this是yImg对象
};
yImg.src = '2.png';
function draw(obj){
var bg = oGC.createPattern(obj,'repeat');
oGC.fillStyle = bg;
oGC.fillRect(0,0,300,150);
}
}; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d');
var obj = oGC.createLinearGradient(150,100,250,200);//渐变区域起点坐标终点坐标
obj.addColorStop(0,'red');
obj.addColorStop(0.5,'yellow');
obj.addColorStop(1,'blue');
oGC.fillStyle = obj;
oGC.fillRect(150,100,100,100);
}; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d'); var obj = oGC.createRadialGradient(200,200,100,200,200,150); obj.addColorStop(0,'red');
obj.addColorStop(0.5,'yellow');
obj.addColorStop(1,'blue'); oGC.fillStyle = obj; oGC.fillRect(0,0,oC.width,oC.height); }; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d');
oGC.font = '60px impact';
oGC.textBaseline = 'middle'; //middle bottom
oGC.fillText('妙味课堂',0,0);
oGC.strokeText('妙味课堂',0,200);
}; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d');
oGC.font = '60px impact';
oGC.textBaseline = 'middle'; //middle bottom
var w = oGC.measureText('妙味课堂').width;//没有高度
oGC.fillText('妙味课堂',(oC.width - w)/2,(oC.height - 60)/2);
}; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
<!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-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
body{ background:black;}
#c1{ background:white;}
</style>
<script> window.onload = function(){
var oC =document.getElementById('c1');
var oGC = oC.getContext('2d');
oGC.font = '60px impact';
oGC.textBaseline = 'top'; //middle bottom
oGC.shadowOffsetX = 10;
oGC.shadowOffsetY = 10;
oGC.shadowBlur = 3;
alert(oGC.shadowColor); //默认颜色：黑色透明
oGC.shadowColor = 'yellow';
var w = oGC.measureText('妙味课堂').width;
oGC.fillText('妙味课堂',(oC.width - w)/2,(oC.height - 60)/2);
}; </script>
</head> <body>
<canvas id="c1" width="400" height="400"></canvas>
</body>
</html>
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