Circles and funny stuffs

1 files changed, 100 insertions, 0 deletions

diff --git a/lib/shape.cc b/lib/shape.cc
index e586d6d..972600c 100644
--- a/lib/shape.cc
+++ b/lib/shape.cc
@@ -1,3 +1,4 @@
+#include <math.h>
 #include <SDL.h>
 #include "engine.h"
 #include "base.h"
@@ -92,6 +93,105 @@ void mogltk::shape::pixel(int x, int y, ColorP c) {
     LEAVE;
 }
 
+void mogltk::shape::circle(int x0, int y0, int r, ColorP c) {
+    ENTER;
+    
+    int x = 0;
+    int y = r - 1;
+    int d = 3 - 2 * r;
+    int dI = 10 - 4 * r;
+    int rI = 6;
+    
+    while (x <= y) {
+	pixel(x0 + x, y0 + y, c);
+	pixel(x0 - x, y0 + y, c);
+	pixel(x0 + x, y0 - y, c);
+	pixel(x0 - x, y0 - y, c);
+	pixel(x0 + y, y0 + x, c);
+	pixel(x0 - y, y0 + x, c);
+	pixel(x0 + y, y0 - x, c);
+	pixel(x0 - y, y0 - x, c);
+	if (d >= 0) {
+	    d += dI;
+	    dI += 8;
+	    y -= 1;
+	} else {
+	    d += rI;
+	    dI += 4;
+	}
+	rI += 4;
+	x += 1;
+    }
+
+    LEAVE;
+}
+
+void mogltk::shape::pcircle(int x0, int y0, int r, ColorP c) {
+    ENTER;
+    
+    int x = 0;
+    int y = r - 1;
+    int d = 3 - 2 * r;
+    int dI = 10 - 4 * r;
+    int rI = 6;
+    
+    while (x <= y) {
+	hline(x0 - x, x0 + x, y0 + y, c);
+	hline(x0 - x, x0 + x, y0 - y, c);
+	hline(x0 - y, x0 + y, y0 + x, c);
+	hline(x0 - y, x0 + y, y0 - x, c);
+	if (d >= 0) {
+	    d += dI;
+	    dI += 8;
+	    y -= 1;
+	} else {
+	    d += rI;
+	    dI += 4;
+	}
+	rI += 4;
+	x += 1;
+    }
+
+    LEAVE;
+}
+
+void mogltk::shape::arc(int x0, int y0, int r, double a1, double a2, ColorP c) {
+    ENTER;
+    
+    int x = 0;
+    int y = r - 1;
+    int d = 3 - 2 * r;
+    int dI = 10 - 4 * r;
+    int rI = 6;
+    
+    while (x <= y) {
+	pixel(x0 + y, y0 - x, c); // 1
+	pixel(x0 + x, y0 - y, c); // 2
+	pixel(x0 - x, y0 - y, c); // 3
+	pixel(x0 - y, y0 - x, c); // 4
+	pixel(x0 - y, y0 + x, c); // 5
+	pixel(x0 - x, y0 + y, c); // 6
+	pixel(x0 + x, y0 + y, c); // 7
+	pixel(x0 + y, y0 + x, c); // 8
+    
+	if (d >= 0) {
+	    d += dI;
+	    dI += 8;
+	    y -= 1;
+	} else {
+	    d += rI;
+	    dI += 4;
+	}
+	rI += 4;
+	x += 1;
+    }
+
+    LEAVE;
+}
+
+void mogltk::shape::arc(int x0, int y0, int r, int x1, int y1, int x2, int y2, ColorP c) {
+}
+
 void mogltk::shape::obox(int x1, int y1, int x2, int y2, ColorP c) {
     ENTER;