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95 lines
2.6 KiB
95 lines
2.6 KiB
#define OLC_PGE_APPLICATION
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#include "pixelGameEngine.h"
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#if defined(__EMSCRIPTEN__)
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#include <emscripten.h>
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#define FILE_RESOLVE(url, file) emscripten_wget(url, file); emscripten_sleep(0)
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#else
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#define FILE_RESOLVE(url, file)
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#endif
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using namespace olc;
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float angle_difference(float angle_1, float angle_2)
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{
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angle_1=(angle_1<0)?angle_1+360:fmod(angle_1,360);
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angle_2=(angle_2<0)?angle_2+360:fmod(angle_2,360);
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float angle_diff = angle_1 - angle_2;
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if (angle_diff > 180)
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angle_diff -= 360;
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else if (angle_diff < -180)
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angle_diff += 360;
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return -angle_diff;
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}
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//Points an angle from point1 to point2, returning an angle between 0-2*PI.
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// (atan2 returns -PI to PI)
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float atan2fmod(vd2d point1,vd2d point2){
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float angle = atan2f(point2.y-point1.y,point2.x-point1.x);
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if (angle<0) {
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angle+=2*3.14159f;
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}
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return angle;
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}
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class Object{
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public:
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float facing_dir;
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float rotation_spd;
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vd2d pos;
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vd2d size;
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Object(vd2d pos, vd2d size, float rotation_spd=100*(3.14159f/180.f), float facing_dir=0)
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:pos(pos),size(size),rotation_spd(rotation_spd),facing_dir(facing_dir) {}
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void draw(PixelGameEngine*pge) {
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pge->DrawCircle(pos,size.x);
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pge->DrawLine(pos,{(int)(pos.x+4*cos(facing_dir)),(int)(pos.y+4*sin(facing_dir))});
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}
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};
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// Override base class with your custom functionality
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class Example : public olc::PixelGameEngine
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{
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public:
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Example()
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{
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// Name your application
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sAppName = "Rotation";
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}
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public:
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Object*testRotationObj;
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bool OnUserCreate() override
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{
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testRotationObj = new Object({(double)ScreenWidth()/2,(double)ScreenHeight()/2},{8,8});
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return true;
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}
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bool OnUserUpdate(float fElapsedTime) override
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{
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Clear(BLACK);
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float diffAng = atan2fmod(testRotationObj->pos,GetMousePos());
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float rotAngle=angle_difference((180.f/3.14159f)*testRotationObj->facing_dir,(180.f/3.14159f)*diffAng);
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//std::cout<<diffAng<<std::endl;
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//std::cout<<" "<<rotAngle<<std::endl;
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if (abs(rotAngle)>testRotationObj->rotation_spd*fElapsedTime*(180.f/3.14159f)) {
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if (rotAngle>0) {
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testRotationObj->facing_dir+=testRotationObj->rotation_spd*fElapsedTime;
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} else {
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testRotationObj->facing_dir-=testRotationObj->rotation_spd*fElapsedTime;
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}
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}
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testRotationObj->draw(this);
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return true;
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}
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};
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int main()
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{
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Example demo;
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if (demo.Construct(256, 240, 2, 2))
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demo.Start();
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return 0;
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} |