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Aqua Costa

help with 2d game (Directx 9/C++)

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Ive made a little 2D game using Directx 9 The game contains 2 layers: background sprite and terrain sprite , and the player sprite Full Game: http://img249.imageshack.us/i/gamea.png/ Background Sprite: http://img217.imageshack.us/i/backgroundo.png/ Terrain Sprite: http://img109.imageshack.us/i/terrain.png/ Player Sprite: http://img513.imageshack.us/i/playerk.png/ My question is how can I know playerY based on the terrainY in playerX position Like when player clicks right button, player sprite moves x = x+1 and y = terrain.getY(player.x) Can someone tell me how can I do that? I think i need to get the pixel data of terrain but i dont know how to do that...

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here how you can get the color of a certain pixel in a texture.

http://www.gamedev.net/community/forums/topic.asp?topic_id=547224

first find the height of the terrain for each x value.


int terrainheight[terrainwidth];

for(int i=0; i<terrainwidth; i++){
int j=0;

while( [pixel at i,j] is white ){
j++;
}
terrainheight = j;
}




I assumed that 0,0 is the top left of the screen. It first starts scanning from top of the screen and move down until it finds a green spot. It could be better if you start searching from nearby pixels of terrainheight[i-1] but since this is a one time job it is not that important.

after that you can use this array to adjust y position


x++; //or x--
y = terrainheight[x] - radiusofcircle;




I hope that helps

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