JavaScript画布不会从脚本中绘制
我在画布上用六边形制成了一个六边形，当我在脚本中更改其大小并刷新页面时，它可以完美地工作。当然，它需要随时随地更改大小，因此我放置了一个输入数字字段，但是当我尝试将html的大小提供给脚本时，会发生下一件事：
这里是代码：
function size()
{
return document.getElementById('myNumber').value;
}
function drawHex(ctx, x, y)
{
var side = 0;
var size = 10;
ctx.beginPath();
ctx.moveTo(x + size * Math.cos(0), y + size * Math.sin(0));
ctx.fillStyle = "#D1CBCA";
ctx.strokeStyle = "#CCCCCC";
ctx.lineWidth = 1;
for (side; side < 7; side++)
{
ctx.lineTo(x + size * Math.cos(side * 2 * Math.PI / 6), y + size * Math.sin(side * 2 * Math.PI / 6));
}
ctx.fill();
}
function drawSixHex(ctx, x, y)
{
drawHex(ctx, x, y);
drawHex(ctx, x-16, y+10);
drawHex(ctx, x-16, y-10);
drawHex(ctx, x+16, y+10);
drawHex(ctx, x+16, y-10);
drawHex(ctx, x, y+2*10);
drawHex(ctx, x, y-2*10);
}
function drawBoard(x, y, ctx, m)
{
ctx.clearRect(0,0,980,520);
var oldX = x;
var oldY = y;
var diffX = 16;
var diffY = 10;
for (var i = 1; i<=(2*m+1); i++)
{
for (var j = 0; j<m+1; j++)
{
if(i%2!=0)
{
drawHex(ctx, oldX+i*diffX, oldY-diffY+2*j*diffY);
}
else
{
drawHex(ctx, oldX+i*diffX, oldY+2*j*diffY);
}
}
}
for(var k = 1; k<m; k=k+2)
{
drawSixHex(ctx, oldX+(k+2)*diffX, oldY-k*diffY);
drawSixHex(ctx, oldX+(k+2)*diffX, (oldY+2*m*diffY)+(k-2)*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, oldY+(k-(m-1))*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, (oldY+2*m*diffY)-(k-(m-3))*diffY);
}
for(var g = -2*m; g<2*m-2; g=g+2)
{
drawSixHex(ctx, oldX + (m+1)*diffX, oldY+(g)*diffY+(m+1)*diffY);
}
}
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
drawBoard(250, 250, ctx, size()); <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Canvas Hexagonal Map</title>
</head>
<body>
<canvas id="canvas" width="980" height="520" ></canvas>
<br>
<br>
<input type="number" id="myNumber" value="6" min="3" max="8">
<button onclick="size()">Try it</button>
<script src="script.js"></script>
</body>
</html>您需要将size()转换为数字。在size（）前面添加了+：
function size()
{
return +(document.getElementById('myNumber').value);
}
function drawHex(ctx, x, y)
{
var side = 0;
var size = 10;
ctx.beginPath();
ctx.moveTo(x + size * Math.cos(0), y + size * Math.sin(0));
ctx.fillStyle = "#D1CBCA";
ctx.strokeStyle = "#CCCCCC";
ctx.lineWidth = 1;
for (side; side < 7; side++)
{
ctx.lineTo(x + size * Math.cos(side * 2 * Math.PI / 6), y + size * Math.sin(side * 2 * Math.PI / 6));
}
ctx.fill();
}
function drawSixHex(ctx, x, y)
{
drawHex(ctx, x, y);
drawHex(ctx, x-16, y+10);
drawHex(ctx, x-16, y-10);
drawHex(ctx, x+16, y+10);
drawHex(ctx, x+16, y-10);
drawHex(ctx, x, y+2*10);
drawHex(ctx, x, y-2*10);
}
function drawBoard(x, y, ctx, m)
{
ctx.clearRect(0,0,980,520);
var oldX = x;
var oldY = y;
var diffX = 16;
var diffY = 10;
for (var i = 1; i<=(2*m+1); i++)
{
for (var j = 0; j<m+1; j++)
{
if(i%2!=0)
{
drawHex(ctx, oldX+i*diffX, oldY-diffY+2*j*diffY);
}
else
{
drawHex(ctx, oldX+i*diffX, oldY+2*j*diffY);
}
}
}
for(var k = 1; k<m; k=k+2)
{
drawSixHex(ctx, oldX+(k+2)*diffX, oldY-k*diffY);
drawSixHex(ctx, oldX+(k+2)*diffX, (oldY+2*m*diffY)+(k-2)*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, oldY+(k-(m-1))*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, (oldY+2*m*diffY)-(k-(m-3))*diffY);
}
for(var g = -2*m; g<2*m-2; g=g+2)
{
drawSixHex(ctx, oldX + (m+1)*diffX, oldY+(g)*diffY+(m+1)*diffY);
}
}
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
function draw(){
drawBoard(250, 250, ctx, +size());
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Canvas Hexagonal Map</title>
</head>
<body>
<canvas id="canvas" width="980" height="520" ></canvas>
<br>
<br>
<input type="number" id="myNumber" value="6" min="3" max="8">
<button onclick="draw()">Try it</button>
<script src="script.js"></script>
</body>
</html>
JavaScript画布不会从脚本中绘制
我在画布上用六边形制成了一个六边形，当我在脚本中更改其大小并刷新页面时，它可以完美地工作。当然，它需要随时随地更改大小，因此我放置了一个输入数字字段，但是当我尝试将html的大小提供给脚本时，会发生下一件事：
这里是代码：
function size()
{
return document.getElementById('myNumber').value;
}
function drawHex(ctx, x, y)
{
var side = 0;
var size = 10;
ctx.beginPath();
ctx.moveTo(x + size * Math.cos(0), y + size * Math.sin(0));
ctx.fillStyle = "#D1CBCA";
ctx.strokeStyle = "#CCCCCC";
ctx.lineWidth = 1;
for (side; side < 7; side++)
{
ctx.lineTo(x + size * Math.cos(side * 2 * Math.PI / 6), y + size * Math.sin(side * 2 * Math.PI / 6));
}
ctx.fill();
}
function drawSixHex(ctx, x, y)
{
drawHex(ctx, x, y);
drawHex(ctx, x-16, y+10);
drawHex(ctx, x-16, y-10);
drawHex(ctx, x+16, y+10);
drawHex(ctx, x+16, y-10);
drawHex(ctx, x, y+2*10);
drawHex(ctx, x, y-2*10);
}
function drawBoard(x, y, ctx, m)
{
ctx.clearRect(0,0,980,520);
var oldX = x;
var oldY = y;
var diffX = 16;
var diffY = 10;
for (var i = 1; i<=(2*m+1); i++)
{
for (var j = 0; j<m+1; j++)
{
if(i%2!=0)
{
drawHex(ctx, oldX+i*diffX, oldY-diffY+2*j*diffY);
}
else
{
drawHex(ctx, oldX+i*diffX, oldY+2*j*diffY);
}
}
}
for(var k = 1; k<m; k=k+2)
{
drawSixHex(ctx, oldX+(k+2)*diffX, oldY-k*diffY);
drawSixHex(ctx, oldX+(k+2)*diffX, (oldY+2*m*diffY)+(k-2)*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, oldY+(k-(m-1))*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, (oldY+2*m*diffY)-(k-(m-3))*diffY);
}
for(var g = -2*m; g<2*m-2; g=g+2)
{
drawSixHex(ctx, oldX + (m+1)*diffX, oldY+(g)*diffY+(m+1)*diffY);
}
}
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
drawBoard(250, 250, ctx, size()); <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Canvas Hexagonal Map</title>
</head>
<body>
<canvas id="canvas" width="980" height="520" ></canvas>
<br>
<br>
<input type="number" id="myNumber" value="6" min="3" max="8">
<button onclick="size()">Try it</button>
<script src="script.js"></script>
</body>
</html>您需要将size()转换为数字。在size（）前面添加了+：
function size()
{
return +(document.getElementById('myNumber').value);
}
function drawHex(ctx, x, y)
{
var side = 0;
var size = 10;
ctx.beginPath();
ctx.moveTo(x + size * Math.cos(0), y + size * Math.sin(0));
ctx.fillStyle = "#D1CBCA";
ctx.strokeStyle = "#CCCCCC";
ctx.lineWidth = 1;
for (side; side < 7; side++)
{
ctx.lineTo(x + size * Math.cos(side * 2 * Math.PI / 6), y + size * Math.sin(side * 2 * Math.PI / 6));
}
ctx.fill();
}
function drawSixHex(ctx, x, y)
{
drawHex(ctx, x, y);
drawHex(ctx, x-16, y+10);
drawHex(ctx, x-16, y-10);
drawHex(ctx, x+16, y+10);
drawHex(ctx, x+16, y-10);
drawHex(ctx, x, y+2*10);
drawHex(ctx, x, y-2*10);
}
function drawBoard(x, y, ctx, m)
{
ctx.clearRect(0,0,980,520);
var oldX = x;
var oldY = y;
var diffX = 16;
var diffY = 10;
for (var i = 1; i<=(2*m+1); i++)
{
for (var j = 0; j<m+1; j++)
{
if(i%2!=0)
{
drawHex(ctx, oldX+i*diffX, oldY-diffY+2*j*diffY);
}
else
{
drawHex(ctx, oldX+i*diffX, oldY+2*j*diffY);
}
}
}
for(var k = 1; k<m; k=k+2)
{
drawSixHex(ctx, oldX+(k+2)*diffX, oldY-k*diffY);
drawSixHex(ctx, oldX+(k+2)*diffX, (oldY+2*m*diffY)+(k-2)*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, oldY+(k-(m-1))*diffY);
drawSixHex(ctx, oldX+(m-1)*diffX+(k+2)*diffX, (oldY+2*m*diffY)-(k-(m-3))*diffY);
}
for(var g = -2*m; g<2*m-2; g=g+2)
{
drawSixHex(ctx, oldX + (m+1)*diffX, oldY+(g)*diffY+(m+1)*diffY);
}
}
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
function draw(){
drawBoard(250, 250, ctx, +size());
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Canvas Hexagonal Map</title>
</head>
<body>
<canvas id="canvas" width="980" height="520" ></canvas>
<br>
<br>
<input type="number" id="myNumber" value="6" min="3" max="8">
<button onclick="draw()">Try it</button>
<script src="script.js"></script>
</body>
</html>本文发布于:2024-11-11，感谢您对本站的认可！
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