Javascript 如何在画布上创造不同的文字艺术设计?
我们正在尝试使用html5和画布创建文本艺术,如下图所示,但我们无法找到合适的参数来创建此类设计Javascript 如何在画布上创造不同的文字艺术设计?,javascript,html,canvas,Javascript,Html,Canvas,我们正在尝试使用html5和画布创建文本艺术,如下图所示,但我们无法找到合适的参数来创建此类设计 这种文字艺术是否需要其他参数 提前感谢查看html5canvas网站,您可以在那里找到“工具包”,即文本、转换 textart的基础是平面文本。如果希望此平面文本呈波浪线,则必须使用变换来操纵文本,即通过在平面文本上应用贝塞尔曲线 看到这个JSFIDLE和这个线程了吗 html <table><TR><TH>Bezier Curve</TH><
提前感谢查看html5canvas网站,您可以在那里找到“工具包”,即文本、转换 textart的基础是平面文本。如果希望此平面文本呈波浪线,则必须使用变换来操纵文本,即通过在平面文本上应用贝塞尔曲线 看到这个JSFIDLE和这个线程了吗 html
<table><TR><TH>Bezier Curve</TH><TD>
<input size="80" type="text" id="curve" name="curve" value="99.2,177.2,130.02,60.0,300.5,276.2,300.7,176.2">
</TD></TR>
<TR><TH>Text</TH><TD><input size="80" type="text" id="text" name="text" value="testing 1234567890"></TD></TR>
<TR><TD colspan=2><div id="canvasDiv"></div></TD></TR>
</table>
贝塞尔曲线
正文
javascript
var first = true;
startIt();
function startIt()
{
canvasDiv = document.getElementById('canvasDiv');
canvasDiv.innerHTML = '<canvas id="layer0" width="300" height="300"></canvas>'; //for IE
canvas = document.getElementById('layer0');
ctx = canvas.getContext('2d');
ctx.fillStyle = "black";
ctx.font = "18px arial black";
curve = document.getElementById('curve');
curveText = document.getElementById('text');
$(curve).keyup(function(e) {changeCurve();});
$(curveText).keyup(function(e) {changeCurve();});
if (first)
{
changeCurve();
first = false;
}
}
function changeCurve()
{
points = curve.value.split(',');
if (points.length == 8)
drawStack();
}
function drawStack()
{
Ribbon = {maxChar: 50, startX: points[0], startY: points[1],
control1X: points[2], control1Y: points[3],
control2X: points[4], control2Y: points[5],
endX: points[6], endY: points[7]};
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.save();
ctx.beginPath();
ctx.moveTo(Ribbon.startX,Ribbon.startY);
ctx.bezierCurveTo(Ribbon.control1X,Ribbon.control1Y,
Ribbon.control2X,Ribbon.control2Y,
Ribbon.endX,Ribbon.endY);
ctx.stroke();
ctx.restore();
FillRibbon(curveText.value,Ribbon);
}
function FillRibbon(text,Ribbon)
{
var textCurve = [];
var ribbon = text.substring(0,Ribbon.maxChar);
var curveSample = 1000;
xDist = 0;
var i = 0;
for (i = 0; i < curveSample; i++)
{
a = new bezier2(i/curveSample,Ribbon.startX,Ribbon.startY,Ribbon.control1X,Ribbon.control1Y,Ribbon.control2X,Ribbon.control2Y,Ribbon.endX,Ribbon.endY);
b = new bezier2((i+1)/curveSample,Ribbon.startX,Ribbon.startY,Ribbon.control1X,Ribbon.control1Y,Ribbon.control2X,Ribbon.control2Y,Ribbon.endX,Ribbon.endY);
c = new bezier(a,b);
textCurve.push({bezier: a, curve: c.curve});
}
letterPadding = ctx.measureText(" ").width / 4;
w = ribbon.length;
ww = Math.round(ctx.measureText(ribbon).width);
totalPadding = (w-1) * letterPadding;
totalLength = ww + totalPadding;
p = 0;
cDist = textCurve[curveSample-1].curve.cDist;
z = (cDist / 2) - (totalLength / 2);
for (i=0;i<curveSample;i++)
{
if (textCurve[i].curve.cDist >= z)
{
p = i;
break;
}
}
for (i = 0; i < w ; i++)
{
ctx.save();
ctx.translate(textCurve[p].bezier.point.x,textCurve[p].bezier.point.y);
ctx.rotate(textCurve[p].curve.rad);
ctx.fillText(ribbon[i],0,0);
ctx.restore();
x1 = ctx.measureText(ribbon[i]).width + letterPadding ;
x2 = 0;
for (j=p;j<curveSample;j++)
{
x2 = x2 + textCurve[j].curve.dist;
if (x2 >= x1)
{
p = j;
break;
}
}
}
} //end FillRibon
function bezier(b1, b2)
{
//Final stage which takes p, p+1 and calculates the rotation, distance on the path and accumulates the total distance
this.rad = Math.atan(b1.point.mY/b1.point.mX);
this.b2 = b2;
this.b1 = b1;
dx = (b2.x - b1.x);
dx2 = (b2.x - b1.x) * (b2.x - b1.x);
this.dist = Math.sqrt( ((b2.x - b1.x) * (b2.x - b1.x)) + ((b2.y - b1.y) * (b2.y - b1.y)) );
xDist = xDist + this.dist;
this.curve = {rad: this.rad, dist: this.dist, cDist: xDist};
}
function bezierT(t,startX, startY,control1X,control1Y,control2X,control2Y,endX,endY)
{
//calculates the tangent line to a point in the curve; later used to calculate the degrees of rotation at this point.
this.mx = (3*(1-t)*(1-t) * (control1X - startX)) + ((6 * (1-t) * t) * (control2X - control1X)) + (3 * t * t * (endX - control2X));
this.my = (3*(1-t)*(1-t) * (control1Y - startY)) + ((6 * (1-t) * t) * (control2Y - control1Y)) + (3 * t * t * (endY - control2Y));
}
function bezier2(t,startX, startY,control1X,control1Y,control2X,control2Y,endX,endY)
{
//Quadratic bezier curve plotter
this.Bezier1 = new bezier1(t,startX,startY,control1X,control1Y,control2X,control2Y);
this.Bezier2 = new bezier1(t,control1X,control1Y,control2X,control2Y,endX,endY);
this.x = ((1 - t) * this.Bezier1.x) + (t * this.Bezier2.x);
this.y = ((1 - t) * this.Bezier1.y) + (t * this.Bezier2.y);
this.slope = new bezierT(t,startX, startY,control1X,control1Y,control2X,control2Y,endX,endY);
this.point = {t: t, x: this.x, y: this.y, mX: this.slope.mx, mY: this.slope.my};
}
function bezier1(t,startX, startY,control1X,control1Y,control2X,control2Y)
{
//linear bezier curve plotter; used recursivly in the quadratic bezier curve calculation
this.x = (( 1 - t) * (1 - t) * startX) + (2 * (1 - t) * t * control1X) + (t * t * control2X);
this.y = (( 1 - t) * (1 - t) * startY) + (2 * (1 - t) * t * control1Y) + (t * t * control2Y);
}
var first=true;
startIt();
函数startIt()
{
canvasDiv=document.getElementById('canvasDiv');
canvasDiv.innerHTML='';//用于IE
canvas=document.getElementById('layer0');
ctx=canvas.getContext('2d');
ctx.fillStyle=“黑色”;
ctx.font=“18px arial黑色”;
curve=document.getElementById('curve');
curveText=document.getElementById('text');
$(曲线).keyup(函数(e){changeCurve();});
$(curveText).keyup(函数(e){changeCurve();});
如果(第一)
{
改变曲线();
第一个=假;
}
}
函数变化曲线()
{
点=曲线.value.split(',');
if(points.length==8)
drawStack();
}
函数drawStack()
{
Ribbon={maxChar:50,startX:points[0],startY:points[1],
control1X:点[2],control1Y:点[3],
control2X:点[4],control2Y:点[5],
endX:points[6],endY:points[7]};
clearRect(0,0,canvas.width,canvas.height);
ctx.save();
ctx.beginPath();
ctx.moveTo(Ribbon.startX,Ribbon.startY);
ctx.bezierCurveTo(Ribbon.control1X,Ribbon.control1Y,
Ribbon.control2X,Ribbon.control2Y,
Ribbon.endX,Ribbon.endY);
ctx.stroke();
ctx.restore();
FillRibbon(curveText.value,Ribbon);
}
函数FillRibbon(文本,Ribbon)
{
var textCurve=[];
var ribbon=text.substring(0,ribbon.maxChar);
var曲线样本=1000;
xDist=0;
var i=0;
对于(i=0;i
另请参见此因为我喜欢绘画,所以我实现了您问题的两个概念文本艺术。
即使看起来你不再在乎了,这也是为好奇的人准备的 根本原因 为了达到上述效果,你需要利用一种基本上是2D的技术,虽然大大简化了,因为我们将保持左右边缘笔直 本质上,它包括将一个正方形转换成不同的形状1 蓝色方块代表绘制文本的图像,红色方块表示最终图像应如何“变形”。
通过选择合适的
1. For X = 0 To Canvas.Width
1.1 upperY = f_upper(x);
1.2 lowerY = f_lower(x);
1.3 Canvas.DrawImage(SrcCanvs, x, 0, 1, SrcCanvs.Height, x, upperY, 1, lowerY-upperY);