Kha Turtle

A simple implementation of turtle for Kha.

Lines and images are not drawn directly. Instead they are stored in a buffer first and then flushed once the render function is called. The lines and images aren't redrawn, instead the buffer isn't cleared until you tell it to.

Initializing

var walker:Turtle;

public function new()
{
    //Set's origin position at [20,500].
    //Creates an additional buffer to draw to.
    walker = new Turtle(20, 500, Image.createRenderTarget(800, 600));
}

Rendering

public override function render(buffer:Image){

    buffer.g2.end(); // End the current buffer

    walker.start();  // prepair the buffer
    walker.render(); // render intermediate steps
    walker.end();    // done rendering

    buffer.g2.begin(false); //Continue previous buffer without clearing
    buffer.g2.drawImage(walker.buffer, 0, 0); // draw the drawn image to the buffer

}

Properties & functions

penUp()          //Allows you to jump to a position without drawing a line.
penDown()        //Allows lines and images to be drawn.
turnLeft()       //Turns the heading -90 degrees.
turnRight()      //Turns the heading +90 degrees.
turn(degrees)    //Turns the heading with the given amount.
forward(pixels)  //Draws a line of pixels given in the current heading.
backwards(pixels)//Similar to forward just in the opposite direction.
jumpTo(x,y)      //Moves to the specified position

pushTrianglePoint()//Adds the current position as a triangle point.
                   //If 3 points are pushed a triangle is drawn 

// Draws an image at the current position and heading.
dropImage(image, scale, apply heading, offset)

start()      //Prepares the buffer.
clearBuffer()//Clears the buffer before drawing.
end()        //Declares this buffer is done drawing.
render()     //Draws the line and image buffer.
reset()      //Places the drawing point back to its initial point.

heading   //Directly adjust the heading
color     //Color of the current line.
triangleColor     //Color of the current line.
thickness //The thickness of the current line.
buffer    //The buffer to draw too.
drawLines //Whether image should be drawn only.

Example

public function new()
{
    //Set's origin position at [20,500].
    //Creates an additional buffer to draw to.
    walker = new Turtle(20, 500, Image.createRenderTarget(800, 600));
    kochSegment(20);
}

function kochSegment(stepSize:Int): Void{

    walker.forward(stepSize); // Move n amount in current direction
    walker.turnLeft();        // Turn left from current ortientation

    walker.forward(stepSize); 
    walker.turnRight();       // Turn right from current orientation

    walker.forward(stepSize);
    walker.turnRight();

    walker.forward(stepSize);
    walker.turnLeft();

    walker.forward(stepSize);   
}

public override function render(buffer:Image){

    buffer.g2.end(); // End the current buffer

    walker.start();  // prepair the buffer
    walker.render(); // render intermediate steps
    walker.end();    // done rendering

    buffer.g2.begin(false); //Continue previous buffer without clearing
    buffer.g2.drawImage(walker.buffer, 0, 0); // draw the drawn image to the buffer

}