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slide.html
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<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: white;
}
#canvas {
border: 1px solid red;
}
</style>
<script>
window.onload = function () {
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var canvas_w = canvas.width;
var canvas_h = canvas.height;
const startx = canvas_w / 2;
var x = startx; // 从屏幕中间开始画
var direction = -1; // The image direction: 1==righward, -1==leftward
var y = 20; // The Y-coordinate
//透明度处理
var opacity = 100;
var range_element = document.getElementById("rangeValue2");
var range_input_element = document.getElementById("slider2");
range_element.value = range_input_element.value;
opacity = range_element.value;
document.getElementById("slider2").onchange = function () {
range_element.value = range_input_element.value;
opacity = range_element.value;
};
//gap process
var gap = 5;
var range_element1 = document.getElementById("gapRange");
var range_input_element1 = document.getElementById("gapSlider");
range_element1.value = range_input_element1.value;
gap = range_element1.value;
document.getElementById("gapSlider").onchange = function () {
range_element1.value = range_input_element1.value;
gap = range_element1.value;
};
//speedX process
var speedX = 5;
var range_element2 = document.getElementById("speedRange");
var range_input_element2 = document.getElementById("speedSlider");
range_element2.value = range_input_element2.value;
speedX = range_element2.value;
document.getElementById("speedSlider").onchange = function () {
range_element2.value = range_input_element2.value;
speedX = range_element2.value;
};
//color chage
var color = "grey";
document.getElementById("color").onchange = function () {
color = this.value;
};
// Load a new image
// IMPORTANT!!! You must give the image time to load by using img.onload!
var img = new Image();
img.onload = start;
img.src = "lines.png";
var imgWidth=0;
function start() {
// the image is fully loaded sostart animating
imgWidth = img.width;
console.log("image w,h:", imgWidth, img.height);
animate();
}
function animate(time) {
// clear the canvas
ctx.clearRect(0, 0, canvas_w, canvas_h);
// draw
ctx.drawImage(img, x, y);
ctx.save();
var mask_left_width = canvas_w / 2;
ctx.filter = " opacity(" + opacity + "%)"; // contrast(1.4) sepia(1) drop-shadow(-9px 9px 3px #e81)
ctx.fillStyle = color;
//画左右两个掩体
ctx.fillRect(0, 0, mask_left_width, canvas_h);
ctx.fillRect(
mask_left_width + Number(gap),
0,
mask_left_width,
canvas_h
);
ctx.restore();
// update position of image
x += Number(speedX) * direction;
if (x < startx - imgWidth) {
x = startx;
}
// request another loop of animation
requestAnimationFrame(animate);
}//animate
}; //onload()
</script>
</head>
<body>
<canvas id="canvas" width="1920" height="1080"></canvas>
<p>
opacity:
<input
id="slider2"
type="range"
min="95"
max="100"
step="1"
value="100"
/>
<input id="rangeValue2" type="text" size="2" />
color: <input id="color" type="text" size="10" />
</p>
<p>
gap:
<input id="gapSlider" type="range" min="0" max="30" step="1" value="3" />
<input id="gapRange" type="text" size="2" />
</p>
<p>
speedX:
<input
id="speedSlider"
type="range"
min="0"
max="10"
step="1"
value="5"
/>
<input id="speedRange" type="text" size="2" />
</p>
</body>
</html>