TimeDependentMovement
From SWWorkshop
Previous example we explain how to draw color and transparent primitives. But all of drawing are static. Now we add motion. We move,rotate and scale primitives. In GameLoop function we change position,rotation or size(pos.x+=10 rot+=5) But we have a little problem. GameLoop function call frequency equals to screen refresh. In different PC it will changes. We must fixed refresh rate or attach timer.
Below exampe we attach movement with swTimer. In game initialization we define timers.
ScreenShot
Api Docs
SwEngine, swGraphics, swTimer, swPoint, swDimension, swApplication,
Source Code
#include "../../include/SWEngine.h" #pragma comment (lib,"../../lib/SWUtil.lib") #pragma comment (lib,"../../lib/SWTypes.lib") #pragma comment (lib,"../../lib/SWCore.lib") #pragma comment (lib,"../../lib/SWEngine.lib") swApplication timeDepMoveApp; swPoint elipsCenter={400,300}; swDimension elipsDim={300,100}; float rot2=0; float rot3=0; //------------------------------------------------------------------------------------------- void rotateSecondElips(void *obj){ //This function triggered 0,05 seconds.. rot2+=10; } //------------------------------------------------------------------------------------------- void rotateThirdElips(void *obj){ //This function triggered 1 seconds rot3-=10; } //------------------------------------------------------------------------------------------- void GameLoop(){ //This function triggered when 1 frame process end Independent Time //Display Scene swGraphicsBeginScene(); //Background swGraphicsSetBgColor0(0.6f,0.6f,0.6f); //BlendingMode swGraphicsSetBlendingMode(SW_BLENDING_MODE_ADDITIVE); //Draw Elips swGraphicsSetColor0(0,1,0,0.5); swGraphicsRenderSolidElips2(&elipsCenter,&elipsDim,30,0); swGraphicsSetColor0(1,0,0,0.5); swGraphicsRenderSolidElips2(&elipsCenter,&elipsDim,30,60+rot2); swGraphicsSetColor0(0,0,1,0.5); swGraphicsRenderSolidElips2(&elipsCenter,&elipsDim,30,120+rot3); swGraphicsEndScene(); } //------------------------------------------------------------------------------------------- int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd) { //Application Settings timeDepMoveApp.hInstance=hInstance; timeDepMoveApp.fullScreen=false; timeDepMoveApp.cursor=true; timeDepMoveApp.width=800; timeDepMoveApp.height=600; timeDepMoveApp.title="Time Dependent Movement"; timeDepMoveApp.path="resource"; timeDepMoveApp.appRun=GameLoop; //Application Execution //Init SWEngine swEngineInit(&timeDepMoveApp); //Init My Application int secondTimer=swTimerCreate(0.05f,NULL,rotateSecondElips); int thirdTimer=swTimerCreate(1.0f,NULL,rotateThirdElips); swEngineRun(); swEngineExit(); return 0; }
