TheGameCreators - CodeBase - Trig calculation, distance angle

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Category: Basic 2D

Version: 1.0

Information

Uploaded: 6th Aug 2010 04:11

Modified: 6th Aug 2010 04:11

Author: HeavyAmp

Summary

Position from angle and disance

Full Description

C++ Source Code

` This code was downloaded from The Game Creators

` It is reproduced here with full permission

` http://www.thegamecreators.com

#include "DarkGDK.h"

void DarkGDK ( void )

{

dbSyncOn();

dbSyncRate(60);

dbDisableEscapeKey();

//Swivel point of haptic hand pen

float posX = 100;

float posY = 100;

//position of end of pen in relation to the swivel point (offset)

float YCord;

float XCord;

//overall position for the end of the pen

float EndPosX;

float EndPosY;

//The distance is the length between the swivel point and end of pen

float Distance = 200;

//Note: In this example all the mouse is doing is giving us an angle to work with

while(true)

{

//------------------------------------------------------------------

//Get Cords from mouse position

float MouseX = dbMouseX();

float MouseY = dbMouseY();

//Get Distance Between 100,100 and mouse position

float DistY = MouseY - posY;

float DistX = MouseX - posX;

//Get angle between the two points( I think the c++ math equivalent is atan() )

float Angle = dbATANFULL( DistY,DistX );

//In this example we have to calculate the angle but in the haptic hand you

//should already know the angle of the swivel point so the above code is not needed

//Work out the offset between the two points

//the important bit of code

YCord = dbSIN( Angle ) * Distance;

XCord = dbCOS( Angle ) * Distance;

//Add the offset to the 100,100 position to worked out the overall position

EndPosX = posX + XCord;

EndPosY = posY + YCord;

//------------------Print out all the coords--------------------

//Print out some white reference lines

dbInk( dbRGB( 255,255,255), 1);

dbLine( posX,posY,posX +200,posY );

dbLine( posX,posY,posX,posY+200  );

//Print out red Pen

dbInk( dbRGB( 255,0,0), 1);

dbLine( posX,posY,EndPosX,EndPosY );

dbInk( dbRGB( 255,255,255), 1);

//Print out the X and Y cords of the end of the pen

char Buffer1[50];

itoa( EndPosX, Buffer1 ,10);

dbText( EndPosX,EndPosY, "X:" );

dbText( EndPosX + 15,EndPosY, Buffer1 );

char Buffer2[50];

itoa( EndPosY, Buffer2 ,10);

dbText( EndPosX + 50,EndPosY, "Y:" );

dbText( EndPosX + 65,EndPosY, Buffer2 );

//Print out the Swivel Point

dbText( 0, 0,"Swivel Point: x:100, y:100" );

//Print out the angle

char BufAngle[50];

itoa( Angle, BufAngle ,10);

dbText( 0 , 20 , "Angle:" );

dbText( 50, 20, BufAngle );

//Print out the length of the pen (Distance)

dbText( 0 , 40 , "Length of pen: 200" );

//--------------------------------------------------------------

if ( dbEscapeKey() )

{

break;

}

dbSync ( );

dbCLS();

}

return;

}

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Author Name:	HeavyAmp
CodeBase Entries:	3

CodeBase - Trig calculation, distance angle