Created BulletPattern-class.

1 files changed, 42 insertions, 0 deletions

diff --git a/bulletpattern.cpp b/bulletpattern.cpp
new file mode 100644
index 0000000..1e8da5e
--- /dev/null
+++ b/bulletpattern.cpp
@@ -0,0 +1,42 @@
+#ifndef __APPLE__
+#include <GL/gl.h>
+#else
+#include <OpenGL/gl.h>
+#endif
+#include <cmath>
+#include "bulletpattern.h"
+
+BulletPattern::BulletPattern() {
+	num_bullets = 0;
+	bullets = new float[2048];
+	
+	int k = 0;
+	
+	for(float i = 0; i < M_PI * 16; i += 0.1) {
+		bullets[k++] = 50.0 + cosf(i) * 5;
+		bullets[k++] = 50.0 + sinf(i) * 5;
+		bullets[k++] = cosf(i) / 100.0;
+		bullets[k++] = sinf(i) / 100.0;
+	}
+}
+
+void BulletPattern::update(unsigned int time, unsigned int step) {
+	if(num_bullets < 503 && num_bullets * 4 < time) {
+		num_bullets += time / 4 - num_bullets;
+	}
+	for(int i = 0; i < num_bullets; i++) {
+		bullets[i*4] += bullets[i*4 + 2] * step;
+		bullets[i*4 + 1] += bullets[i*4 + 3] * step;
+	}
+}
+
+void BulletPattern::draw() {
+	glEnableClientState(GL_VERTEX_ARRAY);
+	
+	glVertexPointer(4, GL_FLOAT, 4 * sizeof(float), bullets);
+	
+	glDrawArrays(GL_POINTS, 0, num_bullets);
+	
+	glDisableClientState(GL_VERTEX_ARRAY);
+	
+}
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