Java(TM) Boutique

import java.applet.*; import java.awt.*; import java.awt.image.*; public class Mandel extends Applet implements Runnable{ int[] pixel; int[] color; Thread mainthread; Graphics bbg; Image bb; Image fractimg; // Configuration: // ---------------------------------------- int nw = 400; // Image width int nh = nw; // Image height // !! Image should be quadratic! int max_i = 300; // max iteration count int n_bailout = 4; // bailout value int colMult = 5; // palette index multiplication factor double sx = -2; // start X double sy = -2; // start Y double ex = 2; // end X double ey = 2; // end Y int pal_len = 2000; // palette size int col_period = 15; // palette color fade 'period' // Other vars: int zoom_sx = 0; int zoom_sy = 0; int zoom_ex = 0; int zoom_ey = 0; boolean mdown = false; public void init(){ // Init stuff: pixel = new int[nw*nh]; bb = createImage(nw,nh); fractimg = createImage(nw,nh); bbg = bb.getGraphics(); initPal(); // initialize palette calcMandel(); setBackground(Color.black); if(mainthread!=null){ mainthread = new Thread(this); mainthread.start(); } } public void stop(){ if(mainthread!=null){ mainthread.stop(); mainthread = null; } } public void destroy(){ bb = null; bbg = null; fractimg = null; } public void run(){ while(true){ repaint(); try{ mainthread.sleep(30); }catch(InterruptedException e){} } } public boolean mouseDown(Event e, int x, int y){ zoom_sx = x; zoom_sy = y; mdown = true; return true; } public boolean mouseUp(Event e, int x, int y){ int tmp = 0; double midx = 0; double midy = 0; double dx = 0; if (mdown){ // Zoom in! mdown = false; zoom_ex = x; zoom_ey = y; if((zoom_sx != zoom_ex)&&(zoom_sy != zoom_ey)){ if(zoom_sx > zoom_ex){ tmp = zoom_sx; zoom_sx = zoom_ex; zoom_ex = tmp; } if(zoom_sy > zoom_ey){ tmp = zoom_sy; zoom_sy = zoom_ey; zoom_ey = tmp; } midx = sx+((((zoom_sx+zoom_ex)/2)*(ex-sx))/(double)nw); midy = sy+((((zoom_sy+zoom_ey)/2)*(ey-sy))/(double)nh); if ((zoom_ex-zoom_sx)>(zoom_ey-zoom_sy)){ dx = ((zoom_ex-zoom_sx)*(ex-sx))/(double)nw; } else{ dx = ((zoom_ey-zoom_sy)*(ey-sy))/(double)nh; } sx = midx-(dx/2); sy = midy-(dx/2); ex = midx+(dx/2); ey = midy+(dx/2); // Recalculate & show: calcMandel(); repaint(); } } return true; } public boolean mouseDrag(Event e, int x, int y){ if(mdown){ zoom_ex = x; zoom_ey = y; repaint(); } return true; } public void update(Graphics g){ paint(g); } public void paint(Graphics g){ int rect_sx, rect_ex, rect_sy, rect_ey; bbg.drawImage(fractimg,0,0,null); // Show zoom rectangle: if(mdown){ if(zoom_sx < zoom_ex){ rect_sx = zoom_sx; rect_ex = zoom_ex; } else{ rect_sx = zoom_ex; rect_ex = zoom_sx; } if(zoom_sy < zoom_ey){ rect_sy = zoom_sy; rect_ey = zoom_ey; } else{ rect_sy = zoom_ey; rect_ey = zoom_sy; } bbg.setColor(Color.black); bbg.drawRect(rect_sx,rect_sy,rect_ex-rect_sx,rect_ey-rect_sy); } g.drawImage(bb,0,0,null); } public void calcMandel(){ double nx=0; double ny=0; double x0=0; double x1=0; double y0=0; double y1=0; double lower=0; double upper=0; double middle=0; double fade_factor=0; int pixx, pixy, i, ncol; boolean bailout = false; double col1[] = new double[3]; double col2[] = new double[3]; int r, g, b; // Loop through entire pixel int array: for(pixy=0;pixy<nh;pixy++){ for(pixx=0;pixx<nw;pixx++){ nx = sx + (((ex-sx)*(double)pixx)/(double)nw); ny = sy + (((ey-sy)*(double)pixy)/(double)nh); i = 0; x0 = 0; y0 = 0; bailout = false; // Loop until bailout value is reached or the iteration count exceeds // the maximum iteration count specified: while(i < max_i){ x1 = x0*x0 - y0*y0 + nx; y1 = 2*x0*y0 + ny; if((x1*x1+y1*y1)>n_bailout){ // Bailout. bailout = true; lower = x0*x0+y0*y0; middle = n_bailout-lower; upper = x1*x1+y1*y1; break; } x0 = x1; y0 = y1; i++; } if (bailout){ // Compute color: ncol = (i*colMult) % pal_len; col1[0] = (double)(color[ncol]>>16 & 255); col1[1] = (double)(color[ncol]>>8 & 255); col1[2] = (double)(color[ncol] & 255); col2[0] = (double)(color[ncol+colMult]>>16 & 255); col2[1] = (double)(color[ncol+colMult]>>8 & 255); col2[2] = (double)(color[ncol+colMult] & 255); fade_factor = upper-lower; r = (int)(col1[0] + (((col2[0]-col1[0])*middle)/fade_factor)); g = (int)(col1[1] + (((col2[1]-col1[1])*middle)/fade_factor)); b = (int)(col1[2] + (((col2[2]-col1[2])*middle)/fade_factor)); pixel[(pixy*nw)+pixx] = (255<<24)|(r<<16)|(g<<8)|(b); } else{ // Use white color: pixel[(pixy*nw)+pixx] = (255<<24)|(16777215); } } } fractimg = createImage(new MemoryImageSource(nw,nh,pixel,0,nw)); } public void initPal(){ int b1, b2, b3; int ppos = 0; // The color fade 'period position' int col1[] = new int[3]; int col2[] = new int[3]; color = new int[pal_len]; col1[0] = (int)(Math.random()*256); col1[1] = (int)(Math.random()*256); col1[2] = (int)(Math.random()*256); col2[0] = (int)(Math.random()*256); col2[1] = (int)(Math.random()*256); col2[2] = (int)(Math.random()*256); for(int i=0;i<pal_len;i++){ b1 = col1[0] + (((col2[0]-col1[0])*ppos)/col_period); b2 = col1[1] + (((col2[1]-col1[1])*ppos)/col_period); b3 = col1[2] + (((col2[2]-col1[2])*ppos)/col_period); color[i] = (255<<24)|(b1<<16)|(b2<<8)|(b3); if(ppos==col_period){ ppos=0; col1[0] = col2[0]; col1[1] = col2[1]; col1[2] = col2[2]; col2[0] = (int)(Math.random()*256); col2[1] = (int)(Math.random()*256); col2[2] = (int)(Math.random()*256); } ppos++; } } }