209 lines
6.4 KiB
Java
209 lines
6.4 KiB
Java
package sig.utils;
|
|
|
|
import java.awt.Color;
|
|
import java.util.Arrays;
|
|
|
|
import sig.SigRenderer;
|
|
|
|
public class DrawUtils {
|
|
static void drawLine(int[] canvas,int sx,int ex,int ny,Color col) {
|
|
for (int i=sx;i<=ex;i++) {
|
|
Draw(canvas,i,ny,col);
|
|
}
|
|
}
|
|
public static void FillTriangle(int[] canvas,int x1, int y1, int x2, int y2, int x3, int y3, Color col)
|
|
{
|
|
int t1x=0, t2x=0, y=0, minx=0, maxx=0, t1xp=0, t2xp=0;
|
|
boolean changed1 = false;
|
|
boolean changed2 = false;
|
|
int signx1=0, signx2=0, dx1=0, dy1=0, dx2=0, dy2=0;
|
|
int e1=0, e2=0;
|
|
// Sort vertices
|
|
if (y1>y2) {int t=y1;y1=y2;y2=t;t=x1;x1=x2;x2=t;}
|
|
if (y1>y3) {int t=y1;y1=y3;y3=t;t=x1;x1=x3;x3=t;}
|
|
if (y2>y3) {int t=y2;y2=y3;y3=t;t=x2;x2=x3;x3=t;}
|
|
|
|
t1x = t2x = x1; y = y1; // Starting points
|
|
dx1 = (int)(x2 - x1); if (dx1<0) { dx1 = -dx1; signx1 = -1; }
|
|
else signx1 = 1;
|
|
dy1 = (int)(y2 - y1);
|
|
|
|
dx2 = (int)(x3 - x1); if (dx2<0) { dx2 = -dx2; signx2 = -1; }
|
|
else signx2 = 1;
|
|
dy2 = (int)(y3 - y1);
|
|
|
|
if (dy1 > dx1) { // swap values
|
|
int t=dx1;dx1=dy1;dy1=t;
|
|
changed1 = true;
|
|
}
|
|
if (dy2 > dx2) { // swap values
|
|
int t=dy2;dy2=dx2;dx2=t;
|
|
changed2 = true;
|
|
}
|
|
|
|
e2 = (int)(dx2 >> 1);
|
|
// Flat top, just process the second half
|
|
boolean goNext=false;
|
|
if (y1 == y2) goNext=true;
|
|
if (!goNext) {
|
|
e1 = (int)(dx1 >> 1);
|
|
|
|
for (int i = 0; i < dx1;) {
|
|
t1xp = 0; t2xp = 0;
|
|
if (t1x<t2x) { minx = t1x; maxx = t2x; }
|
|
else { minx = t2x; maxx = t1x; }
|
|
// process first line until y value is about to change
|
|
loop3:
|
|
while (i<dx1) {
|
|
i++;
|
|
e1 += dy1;
|
|
while (e1 >= dx1) {
|
|
e1 -= dx1;
|
|
if (changed1) t1xp = signx1;//t1x += signx1;
|
|
else break loop3;
|
|
}
|
|
if (changed1) break;
|
|
else t1x += signx1;
|
|
}
|
|
// Move line
|
|
// process second line until y value is about to change
|
|
loop2:
|
|
while (true) {
|
|
e2 += dy2;
|
|
while (e2 >= dx2) {
|
|
e2 -= dx2;
|
|
if (changed2) t2xp = signx2;//t2x += signx2;
|
|
else break loop2;
|
|
}
|
|
if (changed2) break;
|
|
else t2x += signx2;
|
|
}
|
|
if (minx>t1x) minx = t1x; if (minx>t2x) minx = t2x;
|
|
if (maxx<t1x) maxx = t1x; if (maxx<t2x) maxx = t2x;
|
|
drawLine(canvas,minx, maxx, y,col); // Draw line from min to max points found on the y
|
|
// Now increase y
|
|
if (!changed1) t1x += signx1;
|
|
t1x += t1xp;
|
|
if (!changed2) t2x += signx2;
|
|
t2x += t2xp;
|
|
y += 1;
|
|
if (y == y2) break;
|
|
|
|
}
|
|
}
|
|
// Second half
|
|
dx1 = (int)(x3 - x2); if (dx1<0) { dx1 = -dx1; signx1 = -1; }
|
|
else signx1 = 1;
|
|
dy1 = (int)(y3 - y2);
|
|
t1x = x2;
|
|
|
|
if (dy1 > dx1) { // swap values
|
|
int t=dy1;dy1=dx1;dx1=t;
|
|
changed1 = true;
|
|
}
|
|
else changed1 = false;
|
|
|
|
e1 = (int)(dx1 >> 1);
|
|
|
|
for (int i = 0; i <= dx1; i++) {
|
|
t1xp = 0; t2xp = 0;
|
|
if (t1x<t2x) { minx = t1x; maxx = t2x; }
|
|
else { minx = t2x; maxx = t1x; }
|
|
// process first line until y value is about to change
|
|
loop3:
|
|
while (i<dx1) {
|
|
e1 += dy1;
|
|
while (e1 >= dx1) {
|
|
e1 -= dx1;
|
|
if (changed1) { t1xp = signx1; break; }//t1x += signx1;
|
|
else break loop3;
|
|
}
|
|
if (changed1) break;
|
|
else t1x += signx1;
|
|
if (i<dx1) i++;
|
|
}
|
|
// process second line until y value is about to change
|
|
loop2:
|
|
while (t2x != x3) {
|
|
e2 += dy2;
|
|
while (e2 >= dx2) {
|
|
e2 -= dx2;
|
|
if (changed2) t2xp = signx2;
|
|
else break loop2;
|
|
}
|
|
if (changed2) break;
|
|
else t2x += signx2;
|
|
}
|
|
if (minx>t1x) minx = t1x; if (minx>t2x) minx = t2x;
|
|
if (maxx<t1x) maxx = t1x; if (maxx<t2x) maxx = t2x;
|
|
drawLine(canvas,minx, maxx, y,col);
|
|
if (!changed1) t1x += signx1;
|
|
t1x += t1xp;
|
|
if (!changed2) t2x += signx2;
|
|
t2x += t2xp;
|
|
y += 1;
|
|
if (y>y3) return;
|
|
}
|
|
}
|
|
public static void DrawTriangle(int[]canvas,int x1,int y1,int x2,int y2,int x3,int y3,Color col) {
|
|
DrawLine(canvas,x1,y1,x2,y2,col);
|
|
DrawLine(canvas,x2,y2,x3,y3,col);
|
|
DrawLine(canvas,x3,y3,x1,y1,col);
|
|
}
|
|
public static void DrawLine(int[] canvas,int x1,int y1,int x2,int y2,Color col) {
|
|
int x,y,dx,dy,dx1,dy1,px,py,xe,ye,i;
|
|
dx=x2-x1;dy=y2-y1;
|
|
dx1=Math.abs(dx);dy1=Math.abs(dy);
|
|
px=2*dy1-dx1;py=2*dx1-dy1;
|
|
if (dy1<=dx1) {
|
|
if (dx>=0) {
|
|
x=x1;y=y1;xe=x2;
|
|
} else {
|
|
x=x2;y=y2;xe=x1;
|
|
}
|
|
Draw(canvas,x,y,col);
|
|
for (i=0;x<xe;i++) {
|
|
x=x+1;
|
|
if (px<0) {
|
|
px=px+2*dy1;
|
|
} else {
|
|
if ((dx<0&&dy<0)||(dx>0&&dy>0)) {
|
|
y=y+1;
|
|
} else {
|
|
y=y-1;
|
|
}
|
|
px=px+2*(dy1-dx1);
|
|
}
|
|
Draw(canvas,x,y,col);
|
|
}
|
|
} else {
|
|
if (dy>=0) {
|
|
x=x1;y=y1;ye=y2;
|
|
} else {
|
|
x=x2;y=y2;ye=y1;
|
|
}
|
|
Draw(canvas,x,y,col);
|
|
for (i=0;y<ye;i++) {
|
|
y=y+1;
|
|
if (py<=0) {
|
|
py=py+2*dx1;
|
|
} else {
|
|
if ((dx<0&&dy<0)||(dx>0&&dy>0)) {
|
|
x=x+1;
|
|
} else {
|
|
x=x-1;
|
|
}
|
|
py=py+2*(dx1-dy1);
|
|
}
|
|
Draw(canvas,x,y,col);
|
|
}
|
|
}
|
|
}
|
|
public static void Draw(int[] canvas,int x,int y,Color col) {
|
|
if (x>=0&&y>=0&&x<SigRenderer.SCREEN_WIDTH&&y<SigRenderer.SCREEN_HEIGHT) {
|
|
//System.out.println(x+","+y);
|
|
canvas[x+y*SigRenderer.SCREEN_WIDTH]=col.getRGB();
|
|
}
|
|
}
|
|
}
|