1 //GraphicsBasics.cpp  2   3 /*  4 Copyright 2000-2004 The VCF Project.  5 Please see License.txt in the top level directory  6 where you installed the VCF.  7 */  8   9  10 #include "vcf/ApplicationKit/ApplicationKit.h" 11  12  13 using namespace VCF; 14  15  16 /** 17 This simple example will demostrate the basics of using the GraphicsContext 18 class for drawing. 19 */ 20 class GraphicsBasicsWindow : public Window { 21 public: 22     GraphicsBasicsWindow() { 23         setCaption( "GraphicsBasics" ); 24     } 25  26     virtual ~GraphicsBasicsWindow(){}; 27  28  29  30     /** 31     To start with we need to override the paint() method 32     to handle any custom drawing for our window (or any other control for 33     that matter). 34  35     When drawing with the GraphicsContext, the origin is always at the top left 36     of the control. The default origin is at 0,0 unless you change it. 37     Drawing consists of setting various properties of the GraphicsContext, 38     telling it to execute certain drawing commands, and then telling the GraphicsContext 39     to stroke or fill the path, if neccessary. Any line drawing, such as straight 40     lines, rectangles, ellipses, polylines, etc, are not drawn till the 41     GraphicsContext::strokePath() or GraphicsContext::filePath() is called. 42  43  44     Drawing text or images happens right away. 45     */ 46     virtual void paint( GraphicsContext* ctx ) { 47         //Make sure to call the sub classes paint method 48         Window::paint( ctx ); 49  50         ctx->setStrokeWidth( 1.0 ); 51         /** 52         Set the current color 53         */ 54         ctx->setColor( Color::getColor( "black" ) ); 55  56  57         /** 58         Lets draw a rectangle, then offset and draw it again, but filled 59         with a blue color 60         */ 61         Rect rect( 20, 20, 100, 100 ); 62         ctx->rectangle( &rect ); 63         ctx->strokePath(); 64  65  66         /** 67         offset the rect by 100 pixels in the y direction 68         */ 69         rect.offset( 0, 100 ); 70         ctx->setColor( &Color(0.0,0.0,1.0) ); //r,g,b, blue is r(0), g(0), b(1) 71         ctx->rectangle( &rect ); 72         ctx->fillPath(); 73  74  75         double x = rect.left_; 76         double y = rect.bottom_ + 50; 77  78         /** 79         Lets draw 5 lines, each one thicker than the next 80         */ 81         for (int i=0;i<5;i++) { 82             /** 83             set the stroke width 84             */ 85             ctx->setStrokeWidth( i + 1 ); 86  87             /** 88             draw a horizontal line 100 pixels long 89             */ 90             ctx->moveTo( x, y + i*10 ); 91             ctx->lineTo( x + 100, y + i*10 ); 92             ctx->strokePath(); 93         } 94  95         /** 96         reset the stroke width back to 0 97         */ 98         ctx->setStrokeWidth( 1.0 ); 99 100 101         /**102         Lets draw some simple text with the current font103         */104 105         x = 200;106         y = 20;107 108         ctx->textAt( x, y, "Here‘s some simple text" );109 110         /**111         Let‘s modify the current font and make it larger112         */113 114         ctx->getCurrentFont()->setPointSize( 23 );115         y += 50;116 117         ctx->textAt( x, y, "Here‘s some simple text" );118 119 120         /**121         Create a font from scratch and then set the GraphicsContext‘s122         current font123         */124 125         Font myFont( "Arial", 40 );126         myFont.setItalic( true );127 128         /**129         Note that to change the color that text is rendered in130         you have to change the Font‘s color, not the GraphicsContext‘s color131         */132         myFont.setColor( &Color(1.0,0.0,0.0) );133 134         /**135         Set the current font - the GraphicsContext keeps it own font instance, and136         simply copies all the attributes of the font passed into setCurrentFont().137         This means the font you pass in can be temporary, and allocated on the stack138         if you want.139         */140         ctx->setCurrentFont( &myFont );141 142         y += 50;143 144         ctx->textAt( x, y, "Here‘s some simple text" );145 146 147         148         BezierCurve path;149         path.moveTo(50,50);150         path.lineTo(50,100);151         path.lineTo(100,100);152         path.lineTo(100,50);153         path.lineTo(50,50);154         // the above produces a rectangle155         // but i continue drawing over the rectangle:156         path.lineTo(75,75);157         path.lineTo(100,50);158         // which should have no effect, but it does...159 160         BasicFill fill;161         Color color(0.0,0.0,0.0);162         fill.setColor(&color);163         // c is the current graphicsContext164         ctx->setCurrentFill(&fill);165         ctx->draw(&path);166         ctx->setCurrentFill(NULL);167     }168 };169 170 171 /**172 The application class173 */174 175 class GraphicsBasicsApplication : public Application {176 public:177 178     GraphicsBasicsApplication(int argc, char** argv) : Application(argc,argv){179 180     }181     virtual bool initRunningApplication(){182         bool result = Application::initRunningApplication();183 184         Window* mainWindow = new GraphicsBasicsWindow();185         setMainWindow(mainWindow);186         mainWindow->setBounds( 5.0, 100.0, 800.0, 375.0 );187         mainWindow->show();188 189         return result;190     }191 192 };193 194 195 int main(int argc, char *argv[])196 {197     Application* app = new GraphicsBasicsApplication( argc, argv );198 199     Application::main();200 201     return 0;202 }203 204 205 /**206 $Id: GraphicsBasics.cpp 3153 2007-08-04 04:27:44Z ddiego $207 */