Mercurial > sdl-ios-xcode

annotate XCodeiPhoneOS/Demos/src/touch.c @ 2419:ab89ff6e97af gsoc2008_iphone

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Originally keyboard support was in the form of a category of the class SDL_uikitview. It turns out this can cause problems with compilation where the code is not actually included and doesn't fail until dynamic dispatch. This is just awful, so I've moved to the code into the SDL_uikitview class itself.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Wed, 13 Aug 2008 23:14:36 +0000
parents c5cbbba41c65
children
rev   line source
2386
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
1 /*
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
2 * touch.c
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
3 * written by Holmes Futrell
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
4 * use however you want
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
5 */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
6
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
7 #include "SDL.h"
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
8 #include "math.h"
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
9 #include "common.h"
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
10
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
11 #define BRUSH_SIZE 32 /* width and height of the brush */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
12 #define PIXELS_PER_ITERATION 5 /* number of pixels between brush blots when forming a line */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
13
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
14 static SDL_TextureID brushID=0; /* texture for the brush */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
15
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
16 /*
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
17 draws a line from (startx, starty) to (startx + dx, starty + dy)
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
18 this is accomplished by drawing several blots spaced PIXELS_PER_ITERATION apart
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
19 */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
20 void drawLine(float startx, float starty, float dx, float dy) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
21
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
22 float distance = sqrt(dx*dx+dy*dy); /* length of line segment (pythagoras) */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
23 int iterations = distance / PIXELS_PER_ITERATION + 1; /* number of brush sprites to draw for the line */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
24 float dx_prime = dx / iterations; /* x-shift per iteration */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
25 float dy_prime = dy / iterations; /* y-shift per iteration */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
26 SDL_Rect dstRect; /* rect to draw brush sprite into */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
27
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
28 dstRect.w = BRUSH_SIZE;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
29 dstRect.h = BRUSH_SIZE;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
30
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
31 /* setup x and y for the location of the first sprite */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
32 float x = startx - BRUSH_SIZE / 2.0f;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
33 float y = starty - BRUSH_SIZE / 2.0f;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
34
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
35 int i;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
36 /* draw a series of blots to form the line */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
37 for (i=0; i<iterations; i++) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
38 dstRect.x = x;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
39 dstRect.y = y;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
40 /* shift x and y for next sprite location */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
41 x += dx_prime;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
42 y += dy_prime;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
43 /* draw brush blot */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
44 SDL_RenderCopy(brushID, NULL, &dstRect);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
45 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
46 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
47
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
48 /*
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
49 loads the brush texture
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
50 */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
51 void initializeTexture() {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
52 SDL_Surface *bmp_surface;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
53 bmp_surface = SDL_LoadBMP("stroke.bmp");
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
54 if (bmp_surface == NULL) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
55 fatalError("could not load stroke.bmp");
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
56 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
57 brushID = SDL_CreateTextureFromSurface(SDL_PIXELFORMAT_ABGR8888, bmp_surface);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
58 SDL_FreeSurface(bmp_surface);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
59 if (brushID == 0) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
60 fatalError("could not create brush texture");
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
61 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
62 /* additive blending -- laying strokes on top of eachother makes them brighter */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
63 SDL_SetTextureBlendMode(brushID, SDL_TEXTUREBLENDMODE_ADD);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
64 /* set brush color (red) */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
65 SDL_SetTextureColorMod(brushID, 255, 100, 100);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
66 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
67
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
68 int main(int argc, char *argv[]) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
69
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
70 int x, y, dx, dy; /* mouse location */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
71 Uint8 state; /* mouse (touch) state */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
72 SDL_Event event;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
73 SDL_WindowID windowID; /* main window */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
74 int done; /* does user want to quit? */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
75
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
76 /* initialize SDL */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
77 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
78 fatalError("Could not initialize SDL");
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
79 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
80
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
81 /* create main window and renderer */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
82 windowID = SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,\
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
83 SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN|SDL_WINDOW_BORDERLESS);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
84 SDL_CreateRenderer(windowID, 0, 0);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
85
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
86 /*load brush texture */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
87 initializeTexture();
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
88
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
89 /* fill canvass initially with all black */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
90 SDL_RenderFill(0, 0, 0, 255, NULL);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
91 SDL_RenderPresent();
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
92
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
93 done = 0;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
94 while (!done && SDL_WaitEvent(&event)) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
95 switch (event.type) {
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
96 case SDL_QUIT:
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
97 done = 1;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
98 break;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
99 case SDL_MOUSEMOTION:
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
100 SDL_SelectMouse(event.motion.which); /* select 'mouse' (touch) that moved */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
101 state = SDL_GetMouseState(&x, &y); /* get its location */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
102 SDL_GetRelativeMouseState(&dx, &dy); /* find how much the mouse moved */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
103 if (state & SDL_BUTTON_LMASK) { /* is the mouse (touch) down? */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
104 drawLine(x - dx, y - dy, dx, dy); /* draw line segment */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
105 SDL_RenderPresent();
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
106 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
107 break;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
108 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
109 }
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
110
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
111 /* cleanup */
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
112 SDL_DestroyTexture(brushID);
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
113 SDL_Quit();
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
114
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
115 return 0;
c5cbbba41c65 Touch input demo (multitouch)
Holmes Futrell <hfutrell@umail.ucsb.edu>
parents:
diff changeset
116 }