void setup() { void draw() { draw a rectangle or ellipse wherever the mouse cursor is }
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3 void setup() size(600,600); background(230); smooth(); //set window size //set window background color //for smooth lines void draw() draw a rectangle or ellipse wherever the mouse cursor is
4 void setup() size(600,600); background(230); smooth(); //set window size //set window background color //for smooth lines void draw() fill(255,162,76); ellipse(mousex,mousey,30,30);
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6 void setup() size(600,600); background(230); smooth(); //set window size //set window background color //for smooth lines void draw() background(230); fill(255,162,76); ellipse(mousex,mousey,30,30);
7 void setup() [...] //for smooth lines void draw() if(mousepressed == true) fill(255,162,76); ellipse(mousex,mousey,30,30);
8 void draw() ellipse(mousex,mousey,30,30); void mousepressed() // change color of ellipse void mousemoved() // change color of ellipse
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10 class Shape public Shape(position, size) assign position + size variables here void drawshape() draws some kind of shape using position + size get/set color get/set position
11 Shape pshape; //important: call at the very beginning!! void setup() size(600,600); background(230); smooth(); //set window size //set window background color //for smooth lines pshape = new Shape(30,30,40,40); void draw() pshape.drawshape();
12 class Shape float xpos = 0; float ypos = 0; float swidth = 0; float sheight = 0; color scolor = color(255); public Shape(float xposition, float yposition, float shapewidth, float shapeheight) xpos = xposition; ypos = yposition; swidth = shapewidth; sheight = shapeheight; void drawshape() //any primitives can be drawn here using xpos, ypos, swidth, sheight ellipse(xpos, ypos, swidth, sheight); void setshapecolor(color shapecolor) scolor = shapecolor; color getshapecolor() return scolor; void setposition(float x, float y) xpos = x; ypos = y; float getpositionx() return xpos; float getpositiony() return ypos;
13 Shape pshape; //important: call at the very beginning!! void setup() size(600,600); background(230); smooth(); //set window size //set window background color //for smooth lines pshape = new Shape(30,30,40,40); void draw() pshape.drawshape();
14 void draw() pshape.setposition(mousex, mousey); fill(pshape.getshapecolor()); pshape.drawshape(); void mousepressed() pshape.setshapecolor(color(101,53,107)); void mousereleased() pshape.setshapecolor(color(255,162,76));
15 Shape pshape; void setup() size(600,600); background(230); smooth(); ellipsemode(center); //make sure we define this pshape = new Shape(width/2,height/2,100,100); void draw() fill(pshape.getshapecolor()); pshape.drawshape();
16 Algorithm is mousepointer inside circle? if (distance(mousexy & circlecenterxy) < circleradius) inside else outside Mx,My Cx,Cy
17 //main program void mouseclicked() is mouse pointer inside shape? yes? change color! no? change back to basic color! //Shape class Mx,My Cx,Cy boolean contains(x,y) is distance(shapecenter & x,y) > shaperadius? return true else return false
18 //main program void mousepressed() if(pshape.contains(mousex, mousey)) pshape.setshapecolor(color(101,53,107)); else pshape.setshapecolor(color(255)); //Shape class boolean contains(float x, float y) if(swidth == sheight) //if Shape is a circle float radius = swidth/2; float distance = sqrt(sq(xpos - x) + sq(ypos - y)); if(distance < radius) return true; else return false; else return false;
19 void setup() size(600,600); background(230); smooth(); ellipsemode(center); pshape = new Shape(30,30,40,40); noloop(); void mousepressed() if(pshape.contains(mousex, mousey)) pshape.setshapecolor(color(101,53,107)); else pshape.setshapecolor(color(255)); redraw();
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21 void draw() background(230); fill(pshape.getshapecolor()); pshape.drawshape(); if(mousepressed) if(pshape.contains(mousex,mousey)) pshape.setposition((float)mousex,(float)mousey);
22 Xmin,Ymin Xmax,Ymin if(xmin < Mx < Xmax) && (Ymin < My < Ymax) Mx,My else mouse inside mouse outside Xmin,Ymax Xmax,Ymax
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24 class Shape extends java.awt.polygon public Shape(int[]x, int[]y, int n) [...] drawshape() beginshape(); for(int i=0;i<npoints;i++) vertex(xpoints[i],ypoints[i]); endshape();
25 import picking.*; Shape pshape; Picker picker; void setup() [...] picker = new Picker(this); void draw() background(230); picker.start(0); fill(pshape.getshapecolor()); pshape.drawshape(); picker.stop(); int id = picker.get(mousex, mousey); switch(id) case -1: pshape.setshapecolor(color(0)); break; case 0: pshape.setshapecolor(color(100,23,99)); break;
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28 void draw() background(230); if(keypressed) if(key == 'b') pshape.setshapecolor(color(20,40,255)); else if(key == 'g') pshape.setshapecolor(color(20,255,40)); else if(key == 'r') pshape.setshapecolor(color(255,20,40)); fill(pshape.getshapecolor()); pshape.drawshape();
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