I'm trying to create a basic "tree" shape in processing. I have an initial constructor that takes my arguments and draws them in fixed locations on the background, but I also have a secondary constructor that is supposed to assign random values that I specify so that each time it is drawn the trees are in different locations. However, I am having an issue with Processing where it says
The function random(int) does not exist
import processing.core.PApplet;
import java.util.Random;
public class Tree{
// Instance variables
private int centerX, centerY;
private float scale;
private int trunkR, trunkG, trunkB, leavesR, leavesG, leavesB;
private static PApplet sketch;
public Tree(int theCenterX, int theCenterY, float theScale,
int theTrunkR, int theTrunkG, int theTrunkB,
int theLeavesR, int theLeavesG, int theLeavesB)
{
centerX = theCenterX;
centerY = theCenterY;
scale = theScale;
trunkR = theTrunkR;
trunkG = theTrunkG;
trunkB = theTrunkB;
leavesR = theLeavesR;
leavesG = theLeavesG;
leavesB = theLeavesB;
}
public Tree(){
centerX = random(960.0);
centerY = random(700.0);
scale = random(2.0);
trunkR = random(255.0);
trunkG = random(255.0);
trunkB = random(255.0);
leavesR = random(255.0);
leavesG = random(255.0);
leavesB = random(255.0);
}
public void draw(){
sketch.noStroke();
sketch.fill(trunkR, trunkG, trunkB);
sketch.rect(centerX, centerY, 80*scale, 300*scale);
sketch.fill(leavesR, leavesG, leavesB);
sketch.triangle(centerX - 40*scale, centerY + 40*scale, centerX + 40*scale, centerY - 80*scale, centerX + 120*scale, centerY + 40*scale);
}
public static void setup(PApplet theSketch){
sketch = theSketch;
}
}
Tree tree, tree2, tree3, tree4, randomTree;
void settings(){
size(1000, 1000);
}
void setup(){
setupGraphicClasses();
tree = new Tree(width/2 - 400, height/2 - 100, 1.0, 67, 12, 12, 27, 129, 28);
tree2 = new Tree(width/2 + 200, height/2 + 150, 1.5, 67, 12, 12, 27, 129, 28);
tree3 = new Tree(width/2, height/2 - 80, 0.5, 67, 12, 12, 27, 129, 28);
tree4 = new Tree(width/2 + 320, height/2 - 170, 0.9, 67, 12, 12, 27, 129, 28);
randomTree = new Tree();
}
void draw() {
background(127);
noStroke();
fill(16, 85, 17);
rect(0, 500, 1000, 500);
fill(70, 195, 255);
rect(0, 0, 1000, 500);
tree.draw();
tree4.draw();
tree2.draw();
tree3.draw();
randomTree.draw();
}
public void setupGraphicClasses() {
Tree.setup(this);
}
float
random()
You're calling the random()
function from your Tree
class, not your sketch class. That won't work, because only the sketch class knows about the random()
function.
One approach to fix this is to pass an instance of your sketch into the Tree
class, then use that to get to the random function. Something like this:
void setup(){
Tree tree = new Tree(this);
}
class Tree{
public Tree(PApplet sketch){
float x = sketch.random(100);
}
}
If all you need is the random()
function, this might be overkill though. You could just use the Math.random()
function instead. Of course, this locks you into deploying as Java, which might be overly restrictive.