更新 flash_star

flash_star

@@ -1 +1,184 @@
-123
+#include "PX_Firework.h"
+%定义烟花的各类属性
+typedef enum 
+{
+	PX_FIREWORK_STATE_RAISING,
+	PX_FIREWORK_STATE_BLOOMING,
+}PX_FIREWORK_STATE;
+%构造结构体来表达目标的物理属性
+typedef struct  
+{
+	px_point array[32];
+	unsigned int delay;
+	float size;
+	float vx, vy;
+	px_color clr;
+}PX_Firework_paritcal;
+%将物理结构和状态绑入一个对象
+typedef struct  
+{
+	PX_Firework_paritcal particals[96];
+	PX_FIREWORK_STATE state;
+	unsigned int elapsed;
+}PX_Firework;
+
+%利用逐帧更新实现烟花动画
+void PX_FireworkParticalUpdate(PX_Firework_paritcal* pdesc, unsigned int elapsed)
+{
+%烟花持续时间
+	int i;
+	unsigned int update_atom;
+	if (elapsed>1000)
+	{
+		elapsed = 1000;
+	}
+	while (elapsed)
+	{
+		if (elapsed>10)
+		{
+			update_atom = 10;
+			elapsed -= 10;
+		}
+		else
+		{
+			update_atom = elapsed;
+			elapsed = 0;
+		}
+%运动轨迹
+		pdesc->array[0].x += pdesc->vx * update_atom / 1000;
+		pdesc->array[0].y += pdesc->vy * update_atom / 1000;
+
+		pdesc->vx -= pdesc->vx * 0.9f * update_atom / 1000;
+		pdesc->vy -= pdesc->vy * 0.9f * update_atom / 1000;
+
+		pdesc->delay += update_atom;
+
+%烟花并非一个球体，是一个球体的阵列。
+		while (pdesc->delay > 20)
+		{
+			pdesc->delay -= 20;
+			for (i = PX_COUNTOF(pdesc->array) - 1; i > 0; i--)
+			{
+				pdesc->array[i] = pdesc->array[i - 1];
+			}
+		}
+	}
+}
+%变色效果
+void PX_FireworkParticalRender(PX_Firework_paritcal* pdesc, px_surface * psurface, px_bool bb,unsigned int elapsed)
+{
+	int i;
+	float scale;
+	px_color color;
+
+	for (i = PX_COUNTOF(pdesc->array) - 1; i >= 0; i--)
+	{
+		color = pdesc->clr;
+		if (bb)
+		{
+			if (elapsed > 3000)
+			{
+				elapsed = 3000;
+			}
+			color._argb.a = (px_uchar)((3000 - elapsed) / 3000.f * 255);
+			scale = (PX_COUNTOF(pdesc->array) - i) * (0.5f + elapsed / 2000.f) / PX_COUNTOF(pdesc->array);
+		}
+		else
+		{
+			scale = (PX_COUNTOF(pdesc->array) - i) *1.0f/ PX_COUNTOF(pdesc->array);
+		}
+		color._argb.a = (px_uchar)(color._argb.a*scale);
+		PX_GeoDrawSolidCircle(psurface, (int)pdesc->array[i].x, (int)pdesc->array[i].y, (int)(pdesc->size * scale), color);
+	}
+}
+%绽放的过程
+void PX_FireworkRender(px_surface* psurface, PX_Object* pObject, unsigned int elapsed)
+{
+	PX_Firework* pdesc = PX_ObjectGetDesc(PX_Firework, pObject);
+	pdesc->elapsed += elapsed;
+	if (pdesc->state==PX_FIREWORK_STATE_RAISING)
+	{
+		PX_FireworkParticalUpdate(pdesc->particals, elapsed);
+		PX_FireworkParticalRender(pdesc->particals, psurface,0,pdesc->elapsed);
+
+		if (pdesc->elapsed>=1200)
+		{
+			int i;
+			int j;
+			px_color clr;
+			pdesc->elapsed = 0;
+			pdesc->state = PX_FIREWORK_STATE_BLOOMING;
+
+			for (i = 0; i < PX_COUNTOF(pdesc->particals); i++)
+			{
+				for (j = 0; j < PX_COUNTOF(pdesc->particals->array); j++)
+				{
+					pdesc->particals[i].array[j].x = pdesc->particals[0].array[0].x;
+					pdesc->particals[i].array[j].y = pdesc->particals[0].array[0].y;
+				}
+			}
+			clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
+			for (i=0;i<32;i++)
+			{
+				
+				pdesc->particals[i].vx = 300 * PX_sin_angle(360 * i / 32.f);
+				pdesc->particals[i].vy = 300 * PX_cos_angle(360 * i / 32.f);
+				pdesc->particals[i].clr = clr;
+				pdesc->particals[i].size = 8;
+			}
+%动态变色
+			clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
+			for (i = 32; i < 64; i++)
+			{
+				pdesc->particals[i].vx = 200 * PX_sin_angle(360 * (i - 32) / 32.f);
+				pdesc->particals[i].vy = 200 * PX_cos_angle(360 * (i - 32) / 32.f);
+				pdesc->particals[i].clr = clr;
+				pdesc->particals[i].size = 6;
+			}
+
+			clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
+			for (i = 64; i < 96; i++)
+			{
+				pdesc->particals[i].vx = 100 * PX_sin_angle(360 * (i - 64) / 32.f);
+				pdesc->particals[i].vy = 100 * PX_cos_angle(360 * (i - 64) / 32.f);
+				pdesc->particals[i].clr = clr;
+				pdesc->particals[i].size = 3;
+			}
+		}
+
+	}
+	else if (pdesc->state == PX_FIREWORK_STATE_BLOOMING)
+	{
+		int i;
+		for (i=0;i<PX_COUNTOF(pdesc->particals);i++)
+		{
+			PX_FireworkParticalUpdate(pdesc->particals+i, elapsed);
+			PX_FireworkParticalRender(pdesc->particals+i, psurface,1, pdesc->elapsed);
+		}
+		if (pdesc->elapsed>3000)
+		{
+			PX_ObjectDelayDelete(pObject);
+		}
+	}
+}
+
+%创建烟花实体
+PX_Object* PX_FireworkCreate(px_memorypool* mp, PX_Object* Parent, float x, float y)
+{
+	int i;
+	PX_Firework desc;
+	PX_memset(&desc, 0, sizeof(desc));
+	desc.state = PX_FIREWORK_STATE_RAISING;
+	desc.elapsed = 0;
+	for (i=0;i<PX_COUNTOF(desc.particals[0].array);i++)
+	{
+		desc.particals[0].array[i].x = x;
+		desc.particals[0].array[i].y = y;
+	}
+	desc.particals[0].vx = 0;
+	desc.particals[0].vy = -400;
+	desc.particals[0].size = 6;
+	desc.particals[0].clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
+%返回函数，生成烟花，程序结束
+	return PX_ObjectCreateEx(mp, Parent, x, y, 0, 0, 0, 0, 0, 0, PX_FireworkRender, 0, &desc, sizeof(desc));
+}