更新 flash_star
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flash_star
185
flash_star
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123
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#include "PX_Firework.h"
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%定义烟花的各类属性
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typedef enum
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{
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PX_FIREWORK_STATE_RAISING,
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PX_FIREWORK_STATE_BLOOMING,
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}PX_FIREWORK_STATE;
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%构造结构体来表达目标的物理属性
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typedef struct
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{
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px_point array[32];
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unsigned int delay;
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float size;
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float vx, vy;
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px_color clr;
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}PX_Firework_paritcal;
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%将物理结构和状态绑入一个对象
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typedef struct
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{
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PX_Firework_paritcal particals[96];
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PX_FIREWORK_STATE state;
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unsigned int elapsed;
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}PX_Firework;
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%利用逐帧更新实现烟花动画
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void PX_FireworkParticalUpdate(PX_Firework_paritcal* pdesc, unsigned int elapsed)
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{
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%烟花持续时间
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int i;
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unsigned int update_atom;
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if (elapsed>1000)
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{
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elapsed = 1000;
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}
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while (elapsed)
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{
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if (elapsed>10)
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{
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update_atom = 10;
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elapsed -= 10;
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}
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else
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{
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update_atom = elapsed;
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elapsed = 0;
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}
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%运动轨迹
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pdesc->array[0].x += pdesc->vx * update_atom / 1000;
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pdesc->array[0].y += pdesc->vy * update_atom / 1000;
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pdesc->vx -= pdesc->vx * 0.9f * update_atom / 1000;
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pdesc->vy -= pdesc->vy * 0.9f * update_atom / 1000;
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pdesc->delay += update_atom;
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%烟花并非一个球体，是一个球体的阵列。
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while (pdesc->delay > 20)
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{
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pdesc->delay -= 20;
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for (i = PX_COUNTOF(pdesc->array) - 1; i > 0; i--)
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{
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pdesc->array[i] = pdesc->array[i - 1];
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}
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}
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}
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}
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%变色效果
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void PX_FireworkParticalRender(PX_Firework_paritcal* pdesc, px_surface * psurface, px_bool bb,unsigned int elapsed)
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{
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int i;
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float scale;
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px_color color;
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for (i = PX_COUNTOF(pdesc->array) - 1; i >= 0; i--)
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{
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color = pdesc->clr;
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if (bb)
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{
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if (elapsed > 3000)
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{
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elapsed = 3000;
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}
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color._argb.a = (px_uchar)((3000 - elapsed) / 3000.f * 255);
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scale = (PX_COUNTOF(pdesc->array) - i) * (0.5f + elapsed / 2000.f) / PX_COUNTOF(pdesc->array);
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}
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else
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{
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scale = (PX_COUNTOF(pdesc->array) - i) *1.0f/ PX_COUNTOF(pdesc->array);
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}
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color._argb.a = (px_uchar)(color._argb.a*scale);
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PX_GeoDrawSolidCircle(psurface, (int)pdesc->array[i].x, (int)pdesc->array[i].y, (int)(pdesc->size * scale), color);
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}
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}
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%绽放的过程
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void PX_FireworkRender(px_surface* psurface, PX_Object* pObject, unsigned int elapsed)
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{
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PX_Firework* pdesc = PX_ObjectGetDesc(PX_Firework, pObject);
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pdesc->elapsed += elapsed;
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if (pdesc->state==PX_FIREWORK_STATE_RAISING)
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{
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PX_FireworkParticalUpdate(pdesc->particals, elapsed);
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PX_FireworkParticalRender(pdesc->particals, psurface,0,pdesc->elapsed);
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if (pdesc->elapsed>=1200)
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{
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int i;
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int j;
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px_color clr;
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pdesc->elapsed = 0;
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pdesc->state = PX_FIREWORK_STATE_BLOOMING;
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for (i = 0; i < PX_COUNTOF(pdesc->particals); i++)
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{
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for (j = 0; j < PX_COUNTOF(pdesc->particals->array); j++)
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{
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pdesc->particals[i].array[j].x = pdesc->particals[0].array[0].x;
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pdesc->particals[i].array[j].y = pdesc->particals[0].array[0].y;
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}
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}
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clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
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for (i=0;i<32;i++)
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{
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pdesc->particals[i].vx = 300 * PX_sin_angle(360 * i / 32.f);
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pdesc->particals[i].vy = 300 * PX_cos_angle(360 * i / 32.f);
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pdesc->particals[i].clr = clr;
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pdesc->particals[i].size = 8;
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}
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%动态变色
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clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
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for (i = 32; i < 64; i++)
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{
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pdesc->particals[i].vx = 200 * PX_sin_angle(360 * (i - 32) / 32.f);
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pdesc->particals[i].vy = 200 * PX_cos_angle(360 * (i - 32) / 32.f);
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pdesc->particals[i].clr = clr;
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pdesc->particals[i].size = 6;
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}
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clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
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for (i = 64; i < 96; i++)
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{
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pdesc->particals[i].vx = 100 * PX_sin_angle(360 * (i - 64) / 32.f);
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pdesc->particals[i].vy = 100 * PX_cos_angle(360 * (i - 64) / 32.f);
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pdesc->particals[i].clr = clr;
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pdesc->particals[i].size = 3;
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}
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}
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}
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else if (pdesc->state == PX_FIREWORK_STATE_BLOOMING)
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{
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int i;
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for (i=0;i<PX_COUNTOF(pdesc->particals);i++)
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{
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PX_FireworkParticalUpdate(pdesc->particals+i, elapsed);
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PX_FireworkParticalRender(pdesc->particals+i, psurface,1, pdesc->elapsed);
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}
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if (pdesc->elapsed>3000)
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{
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PX_ObjectDelayDelete(pObject);
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}
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}
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}
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%创建烟花实体
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PX_Object* PX_FireworkCreate(px_memorypool* mp, PX_Object* Parent, float x, float y)
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{
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int i;
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PX_Firework desc;
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PX_memset(&desc, 0, sizeof(desc));
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desc.state = PX_FIREWORK_STATE_RAISING;
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desc.elapsed = 0;
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for (i=0;i<PX_COUNTOF(desc.particals[0].array);i++)
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{
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desc.particals[0].array[i].x = x;
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desc.particals[0].array[i].y = y;
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}
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desc.particals[0].vx = 0;
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desc.particals[0].vy = -400;
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desc.particals[0].size = 6;
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desc.particals[0].clr = PX_COLOR(255, 128 + (PX_rand() % 128), 128 + (PX_rand() % 128), 128 + (PX_rand() % 128));
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%返回函数，生成烟花，程序结束
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return PX_ObjectCreateEx(mp, Parent, x, y, 0, 0, 0, 0, 0, 0, PX_FireworkRender, 0, &desc, sizeof(desc));
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}
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