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annotate XCodeiPhoneOS/Demos/src/touch.c @ 2429:2c55b72ba46e gsoc2008_iphone

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testdyngles is exactly what it sounds like -- a version of testdyngl that uses OpenGL ES calls instead of OpenGL. Was necessary to create because glOrtho is called glOrthof in OpenGL ES, and OpenGL ES doesn't have glBegin() type semantics for specifying geometry.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:52:52 +0000
parents c5cbbba41c65
children
rev   line source
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1 /*
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2 * touch.c
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3 * written by Holmes Futrell
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4 * use however you want
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5 */
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6
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7 #include "SDL.h"
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8 #include "math.h"
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9 #include "common.h"
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10
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11 #define BRUSH_SIZE 32 /* width and height of the brush */
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12 #define PIXELS_PER_ITERATION 5 /* number of pixels between brush blots when forming a line */
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13
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14 static SDL_TextureID brushID=0; /* texture for the brush */
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15
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16 /*
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17 draws a line from (startx, starty) to (startx + dx, starty + dy)
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18 this is accomplished by drawing several blots spaced PIXELS_PER_ITERATION apart
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19 */
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20 void drawLine(float startx, float starty, float dx, float dy) {
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21
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22 float distance = sqrt(dx*dx+dy*dy); /* length of line segment (pythagoras) */
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23 int iterations = distance / PIXELS_PER_ITERATION + 1; /* number of brush sprites to draw for the line */
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24 float dx_prime = dx / iterations; /* x-shift per iteration */
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25 float dy_prime = dy / iterations; /* y-shift per iteration */
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26 SDL_Rect dstRect; /* rect to draw brush sprite into */
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27
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28 dstRect.w = BRUSH_SIZE;
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29 dstRect.h = BRUSH_SIZE;
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30
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31 /* setup x and y for the location of the first sprite */
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32 float x = startx - BRUSH_SIZE / 2.0f;
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33 float y = starty - BRUSH_SIZE / 2.0f;
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34
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35 int i;
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36 /* draw a series of blots to form the line */
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37 for (i=0; i<iterations; i++) {
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38 dstRect.x = x;
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39 dstRect.y = y;
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40 /* shift x and y for next sprite location */
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41 x += dx_prime;
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42 y += dy_prime;
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43 /* draw brush blot */
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44 SDL_RenderCopy(brushID, NULL, &dstRect);
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45 }
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46 }
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47
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48 /*
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49 loads the brush texture
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50 */
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51 void initializeTexture() {
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52 SDL_Surface *bmp_surface;
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53 bmp_surface = SDL_LoadBMP("stroke.bmp");
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54 if (bmp_surface == NULL) {
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55 fatalError("could not load stroke.bmp");
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56 }
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57 brushID = SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, bmp_surface);
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58 SDL_FreeSurface(bmp_surface);
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59 if (brushID == 0) {
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60 fatalError("could not create brush texture");
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61 }
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62 /* additive blending -- laying strokes on top of eachother makes them brighter */
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63 SDL_SetTextureBlendMode(brushID, SDL_TEXTUREBLENDMODE_ADD);
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64 /* set brush color (red) */
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65 SDL_SetTextureColorMod(brushID, 255, 100, 100);
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66 }
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67
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68 int main(int argc, char *argv[]) {
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69
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70 int x, y, dx, dy; /* mouse location */
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71 Uint8 state; /* mouse (touch) state */
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72 SDL_Event event;
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73 SDL_WindowID windowID; /* main window */
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74 int done; /* does user want to quit? */
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75
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76 /* initialize SDL */
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77 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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78 fatalError("Could not initialize SDL");
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79 }
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80
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81 /* create main window and renderer */
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82 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,\
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83 SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
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84 SDL_CreateRenderer(windowID, 0, 0);
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85
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86 /*load brush texture */
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87 initializeTexture();
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88
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89 /* fill canvass initially with all black */
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90 SDL_RenderFill(0, 0, 0, 255, NULL);
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91 SDL_RenderPresent();
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92
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93 done = 0;
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94 while (!done && SDL_WaitEvent(&event)) {
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95 switch (event.type) {
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96 case SDL_QUIT:
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97 done = 1;
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98 break;
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99 case SDL_MOUSEMOTION:
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100 SDL_SelectMouse(event.motion.which); /* select 'mouse' (touch) that moved */
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101 state = SDL_GetMouseState(&x, &y); /* get its location */
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102 SDL_GetRelativeMouseState(&dx, &dy); /* find how much the mouse moved */
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103 if (state & SDL_BUTTON_LMASK) { /* is the mouse (touch) down? */
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104 drawLine(x - dx, y - dy, dx, dy); /* draw line segment */
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105 SDL_RenderPresent();
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106 }
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107 break;
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108 }
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109 }
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110
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111 /* cleanup */
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112 SDL_DestroyTexture(brushID);
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113 SDL_Quit();
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114
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115 return 0;
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116 }