OpenGL Rotation and Zooming.
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James Turk
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@ -13,7 +13,7 @@
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File: ZE_ZImage.h <br>
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Description: Header file for core ZEngine Image and Texture Object. <br>
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Author(s): James Turk, Gamer Tazar <br>
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$Id: ZE_ZImage.h,v 1.2 2002/12/01 07:56:17 cozman Exp $<br>
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$Id: ZE_ZImage.h,v 1.3 2002/12/02 00:36:35 cozman Exp $<br>
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\file ZE_ZImage.h
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\brief Definition file for ZImage.
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@ -149,6 +149,24 @@ class ZImage : public ZObject
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**/
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void SetColorKey(Uint8 red, Uint8 green, Uint8 blue);
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/*!
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\brief Stretch the image by a certain X and Y factor.
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Stretch image using a factor to multiply width and height by.
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\param xFactor Stretch factor for width. [newWidth = oldWidth * xStretch]
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\param yFactor Stretch factor for height. [newHeight = oldHeight * yStretch]
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**/
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void Stretch(float xFactor, float yFactor);
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/*!
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\brief Resizes an image, stretching to new size.
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Stretch image to new width and height.
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\param width New width to stretch image to.
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\param height New height to stretch image to.
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**/
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void Resize(unsigned int width, unsigned int height);
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/*!
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\brief OpenGL related bind call.
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@ -164,7 +182,17 @@ class ZImage : public ZObject
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\param x X coord to draw Image to.
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\param y Y coord to draw Image to.
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**/
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void Draw(int x, int y);
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void Draw(float x, float y);
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/*!
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\brief Draw Image rotated to screen.
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Image is rotated about it's own center by specified angle, then drawn to screen.
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\param x X coord to draw Image to.
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\param y Y coord to draw Image to.
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\param angle Angle in degrees to rotate image.
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**/
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void DrawRotated(int x, int y, float angle);
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/////////////
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//Accessors//
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@ -3,7 +3,7 @@
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File: ZEngine.h <br>
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Description: Public Header File for ZEngine. <br>
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Author(s): James Turk <br>
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$Id: ZEngine.h,v 1.3 2002/12/01 07:56:17 cozman Exp $<br>
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$Id: ZEngine.h,v 1.4 2002/12/02 00:36:35 cozman Exp $<br>
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\file ZEngine.h
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\brief Header file for ZEngine.
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@ -16,16 +16,17 @@ $Id: ZEngine.h,v 1.3 2002/12/01 07:56:17 cozman Exp $<br>
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\mainpage ZEngine Documentation
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\author James Turk
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\version 0.7.7
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\version 0.7.8
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\date 1 December, 2002
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\section ZEngine About ZEngine
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<br>
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ZEngine is designed to wrap common interfaces of the SDL API in an Object Oriented manner. It is licensed under
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a very liberal BSD-style license, and anyone is free to suggest or implement changes to be added to the Engine. In addition
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ZEngine hopes to provide a core engine which can be used to develop a game without having to rewrite large amounts
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of code. As of version 0.7.7 ZEngine uses OpenGL rather than SDL to do 2D drawing, thus increasing the use of the engine
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and making the engine much faster in most test cases.
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ZEngine is designed to wrap common interfaces of the SDL API in an Object Oriented manner. <br> It is licensed under
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a very liberal BSD-style license, and anyone is free to suggest or implement changes to be added to the Engine.<br>
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In addition ZEngine aims to provide a core engine which can be used to develop a game without having to
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rewrite large amounts of code.<br>
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As of version 0.7.7 ZEngine uses OpenGL rather than SDL to do 2D drawing, thus increasing the uses of the engine
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and making the engine much faster in most test cases.<br>
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\section Licensing Licensing
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<br><pre>
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@ -13,7 +13,7 @@
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File: ZE_ZImage.cpp <br>
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Description: Implementation source file for core ZEngine Image or Texture Object. <br>
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Author(s): James Turk, Gamer Tazar <br>
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$Id: ZE_ZImage.cpp,v 1.3 2002/12/01 07:56:17 cozman Exp $<br>
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$Id: ZE_ZImage.cpp,v 1.4 2002/12/02 00:36:35 cozman Exp $<br>
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\file ZE_ZImage.cpp
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\brief Source file for ZImage.
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@ -151,23 +151,55 @@ void ZImage::SetColorKey(Uint8 red, Uint8 green, Uint8 blue)
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LogError("ZImage not initialized in ZImage::SetColorKey.");
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}
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void ZImage::Stretch(float xFactor, float yFactor)
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{
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rWidth = static_cast<unsigned int>(xFactor*rWidth);
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rHeight = static_cast<unsigned int>(yFactor*rHeight);
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}
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void ZImage::Resize(unsigned int width, unsigned int height)
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{
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rWidth = width;
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rHeight = height;
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}
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void ZImage::Bind()
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{
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glBindTexture(GL_TEXTURE_2D, rTexID);
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}
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void ZImage::Draw(int x, int y)
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void ZImage::Draw(float x, float y)
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{
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Bind();
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glBegin(GL_TRIANGLE_STRIP);
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glTexCoord2f(0.0f,0.0f); glVertex2i(x, y);
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glTexCoord2f(rTexMaxX,0.0f); glVertex2i(x+rWidth, y);
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glTexCoord2f(0.0f,rTexMaxY); glVertex2i(x, y+rHeight);
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glTexCoord2f(rTexMaxX,rTexMaxY); glVertex2i(x+rWidth, y+rHeight);
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glTexCoord2f(0.0f,0.0f); glVertex2f(x, y);
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glTexCoord2f(rTexMaxX,0.0f); glVertex2f(x+rWidth, y);
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glTexCoord2f(0.0f,rTexMaxY); glVertex2f(x, y+rHeight);
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glTexCoord2f(rTexMaxX,rTexMaxY); glVertex2f(x+rWidth, y+rHeight);
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glEnd();
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}
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void ZImage::DrawRotated(int x, int y, float angle)
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{
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float cX,cY; //center variables
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cX = rWidth/2.0f;
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cY = rHeight/2.0f;
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glPushMatrix();
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glTranslatef(x+cX,y+cY,0);
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glRotatef(angle,0,0,1.0f);
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Bind();
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glBegin(GL_TRIANGLE_STRIP);
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glTexCoord2f(0.0f,0.0f); glVertex2f(-cX, -cY);
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glTexCoord2f(rTexMaxX,0.0f); glVertex2f(-cX+rWidth, -cY);
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glTexCoord2f(0.0f,rTexMaxY); glVertex2f(-cX, -cY+rHeight);
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glTexCoord2f(rTexMaxX,rTexMaxY); glVertex2f(-cX+rWidth, -cY+rHeight);
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glEnd();
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glPopMatrix();
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}
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bool ZImage::IsLoaded()
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{
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return glIsTexture(rTexID) == GL_TRUE;
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@ -34,17 +34,17 @@ void Initialize()
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void Test()
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{
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ZEngine *engine = ZEngine::GetInstance();
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float angle=0.0f;
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//Open and Setup all the Images//
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SDL_Surface *temp;
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ZImage image1, image2("data/test01.bmp"), image3(image2.Surface(),20,20,20,20), textImage;
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ZImage image1, image2("data/test01.bmp"), image3(image2.Surface(),5,5,20,20), textImage;
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ZFont font("data/almontew.ttf",30);
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temp = SDL_LoadBMP("data/test02.bmp"); //this is a separate surface
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image1.Attach(temp); //this attaches the surface into itself
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temp = NULL; //and temp will now be controlled and freed by image1
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image1.SetColorKey(255,0,255);
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// image2.SetAlpha(75);
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image2.SetColorKey(255,0,255);
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font.SetColor(0,255,0);
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font.SetBGColor(0,0,255);
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@ -66,7 +66,11 @@ void Test()
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engine->Clear(); //clear screen
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//draw the images//
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image1.Draw(0,0);
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image2.Draw(100,0);
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image2.DrawRotated(100,0,angle);
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if(++angle > 360)
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angle = 0.0f;
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image3.Draw(200,0);
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textImage.Draw(0,100);
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engine->UpdateScreen(); //update the screen
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