How to draw a triangle in a math graph?

Question

How to draw a triangle in a math graph which displays X and Y axis.

Answer 1

To draw shapes using ActionScript2, you can use the moveTo() and lineTo() methods of the MovieClip object. You can specify line colour and thickness with lineStyle(), or make a solid shape using beginFill() and endFill().

So to draw your graph and triangle you could do the following steps:

1. Make a movieClip named "graph"
2. Define how big your graph should be (using the flash.geom.Rectangle object)
3. Draw a grey background using graph.beginFill(grey) and then moveTo() and lineTo()
4. Draw some blue lines at regular intervals for a grid
5. Draw the X and Y axes on the side and bottom of your grid
6. Make a second movieClip named "shape"
7. Pick 3 random points: moveTo(point1), lineTo(point2), lineTo(point3), lineTo(point1)

Here's how the code might look:

import flash.geom.Point;
import flash.geom.Rectangle;

function drawGraph(mc:MovieClip, rect:Rectangle):Void {
//this is a function to draw the graph

    //draw the background
    mc.beginFill(0xF8F8F8);
    mc.moveTo(rect.left, rect.bottom);
    mc.lineTo(rect.left, rect.top);
    mc.lineTo(rect.right, rect.top);
    mc.lineTo(rect.right, rect.bottom);
    mc.lineTo(rect.left, rect.bottom);
    mc.endFill();

    //draw a grid
    var unit:Number = 20;
    mc.lineStyle(1, 0x0000FF, 20, true, "none", "round", "round");
    var i:Number=rect.x;
    do {
        i=i+unit;
        mc.moveTo(i, rect.bottom);
        mc.lineTo(i, rect.top);
    } while (irect.top);

    //draw the axes
    mc.lineStyle(2, 0x808080, 100, true, "none", "round", "round");
    mc.moveTo(rect.left, rect.bottom);
    mc.lineTo(rect.left, rect.top);
    mc.moveTo(rect.left, rect.bottom);
    mc.lineTo(rect.right, rect.bottom);
}

function randomPoint(rect:Rectangle):Point {
//this is a function which returns a random point within rect
    var p:Point = new Point(rect.x+Math.random()*rect.width, rect.y+Math.random()*rect.height);
    return p;
}

function drawTriangle(mc:MovieClip, rect:Rectangle):Void {
//this is a function to draw the triangle

    // pick 3 random points within rect
    var p1:Point = randomPoint(rect);
    var p2:Point = randomPoint(rect);
    var p3:Point = randomPoint(rect);

    //connect the points to make a triangle
    mc.lineStyle(3, 0xFF0000, 100, true, "none", "round", "round");
    mc.moveTo(p1.x, p1.y);
    mc.lineTo(p2.x, p2.y);
    mc.lineTo(p3.x, p3.y);
    mc.lineTo(p1.x, p1.y);

}

//make the 'graph' clip:
var myGraph:MovieClip = this.createEmptyMovieClip("myGraph", this.getNextHighestDepth());
//define the graph size:
var myRect:Rectangle = new Rectangle(50,50,300,300);
drawGraph(myGraph,myRect);//draw the graph
var myShape:MovieClip = this.createEmptyMovieClip("myShape", this.getNextHighestDepth());//make the 'shape' clip
drawTriangle(myShape,myRect);//draw a random triangle

//add a function to draw a new triangle when the graph is clicked:
myGraph.onRelease = function() {
myShape.clear();//erase the old triangle
drawTriangle(myShape,myRect);//draw a new one
}

You can click the graph to generate a new random triangle.

_{(source: webfactional.com)}