Question

So I am drawing a graph with lineTo.

What I want to do is loop through every x coordinate on the lineTo get its Y coordinate and push that to an array, but how do I know what the Y coordinate is at each X coordinate?

Answer 1

var lineStartX=10;
var lineStartY=10;
var lineEndX=450;
var lineEndY=300;
this.lineStyle(5, 0xFF00FF, 100);
this.moveTo(lineStartX, lineStartY);
this.lineTo(lineEndX, lineEndY);

var ratio=(lineEndY-lineStartY)/(lineEndX-lineStartX);
for (var yV:Number=0; yV<=lineEndY-lineStartY; yV+=5) {
 var xV=yV/ratio+lineStartX;

 //Vizualize// 
 this.lineStyle(2, 0xFFF0F0, 100);
 this.moveTo(xV, yV+lineStartY);
 this.lineTo(xV+1, yV+lineStartY+1);
}

for (var xV:Number=0; xV<=lineEndX-lineStartX; xV+=5) {
 var yV=xV*ratio+lineStartY;
}