From: José Fonseca <jfons...@vmware.com>
Not really used/necessary.
---
src/demos/pixeltest.c | 113 +++++++++++++++++++++++---------------------------
1 file changed, 52 insertions(+), 61 deletions(-)
diff --git a/src/demos/pixeltest.c b/src/demos/pixeltest.c
index e9b95b8..0898290 100644
--- a/src/demos/pixeltest.c
+++ b/src/demos/pixeltest.c
@@ -21,24 +21,16 @@ static int WinWidth, WinHeight;
static int APosX, APosY; /* simple drawpixels */
static int BPosX, BPosY; /* read/draw pixels */
int MouseButton, MouseY, MouseX; /* mouse control */
-float x0offset = 0.0f; /* for line translation */
-float y0offset = 0.0f;
-float x1offset = 0.0f;
-float y1offset = 0.0f;
+float X0 = 0.0f; /* for line translation */
+float Y0 = 0.0f;
+float X1 = 0.0f;
+float Y1 = 0.0f;
float width = 1.0f;
-struct Line{
- float x0;
- float y0;
- float x1;
- float y1;
-};
-
#define STEP 16 /* subpixel resolution 1/STEP */
#define SIZE 128 /* of non-zoomed drawing region */
#define ZOOM 32 /* scale factor for zooming */
-struct Line line;
static GLboolean DrawFront = GL_FALSE;
GLushort TempImage[SIZE][SIZE]; /* original 128 by 128 pixel image */
GLushort myImage[SIZE*ZOOM][SIZE*ZOOM]; /* zoom by a factor of 32 */
@@ -177,32 +169,32 @@ drawMagnifiedView(void)
}
/* Draws the actual line on zoomed version */
- drawline(line.x0+x0offset+APosX-MouseX, line.y0+y0offset+APosY-MouseY,
- line.x1+x1offset+APosX-MouseX, line.y1+y1offset+APosY-MouseY, 0);
+ drawline(X0+APosX-MouseX, Y0+APosY-MouseY,
+ X1+APosX-MouseX, Y1+APosY-MouseY, 0);
/* Draws bounding line area */
- if (fabsf(line.x0 + x0offset - line.x1 - x1offset) >=
- fabsf(line.y0 + y0offset - line.y1 - y1offset)) {
+ if (fabsf(X0 - X1) >=
+ fabsf(Y0 - Y1)) {
/* X-MAJOR line */
- drawline(line.x0+x0offset+APosX-MouseX,
line.y0+y0offset+APosY-MouseY+halfwidth,
- line.x1+x1offset+APosX-MouseX,
line.y1+y1offset+APosY-MouseY+halfwidth, 0xffff);
- drawline(line.x0+x0offset+APosX-MouseX,
line.y0+y0offset+APosY-MouseY-halfwidth,
- line.x1+x1offset+APosX-MouseX,
line.y1+y1offset+APosY-MouseY-halfwidth, 0xffff);
- drawline(line.x0+x0offset+APosX-MouseX,
line.y0+y0offset+APosY-MouseY+halfwidth,
- line.x0+x0offset+APosX-MouseX,
line.y0+y0offset+APosY-MouseY-halfwidth, 0xffff);
- drawline(line.x1+x1offset+APosX-MouseX,
line.y1+y1offset+APosY-MouseY+halfwidth,
- line.x1+x1offset+APosX-MouseX,
line.y1+y1offset+APosY-MouseY-halfwidth, 0xffff);
+ drawline(X0+APosX-MouseX, Y0+APosY-MouseY+halfwidth,
+ X1+APosX-MouseX, Y1+APosY-MouseY+halfwidth, 0xffff);
+ drawline(X0+APosX-MouseX, Y0+APosY-MouseY-halfwidth,
+ X1+APosX-MouseX, Y1+APosY-MouseY-halfwidth, 0xffff);
+ drawline(X0+APosX-MouseX, Y0+APosY-MouseY+halfwidth,
+ X0+APosX-MouseX, Y0+APosY-MouseY-halfwidth, 0xffff);
+ drawline(X1+APosX-MouseX, Y1+APosY-MouseY+halfwidth,
+ X1+APosX-MouseX, Y1+APosY-MouseY-halfwidth, 0xffff);
}
else {
/* Y-MAJOR line */
- drawline(line.x0+x0offset+APosX-MouseX+halfwidth,
line.y0+y0offset+APosY-MouseY,
- line.x1+x1offset+APosX-MouseX+halfwidth,
line.y1+y1offset+APosY-MouseY, 0xffff);
- drawline(line.x0+x0offset+APosX-MouseX-halfwidth,
line.y0+y0offset+APosY-MouseY,
- line.x1+x1offset+APosX-MouseX-halfwidth,
line.y1+y1offset+APosY-MouseY, 0xffff);
- drawline(line.x0+x0offset+APosX-MouseX+halfwidth,
line.y0+y0offset+APosY-MouseY,
- line.x0+x0offset+APosX-MouseX-halfwidth,
line.y0+y0offset+APosY-MouseY, 0xffff);
- drawline(line.x1+x1offset+APosX-MouseX+halfwidth,
line.y1+y1offset+APosY-MouseY,
- line.x1+x1offset+APosX-MouseX-halfwidth,
line.y1+y1offset+APosY-MouseY, 0xffff);
+ drawline(X0+APosX-MouseX+halfwidth, Y0+APosY-MouseY,
+ X1+APosX-MouseX+halfwidth, Y1+APosY-MouseY, 0xffff);
+ drawline(X0+APosX-MouseX-halfwidth, Y0+APosY-MouseY,
+ X1+APosX-MouseX-halfwidth, Y1+APosY-MouseY, 0xffff);
+ drawline(X0+APosX-MouseX+halfwidth, Y0+APosY-MouseY,
+ X0+APosX-MouseX-halfwidth, Y0+APosY-MouseY, 0xffff);
+ drawline(X1+APosX-MouseX+halfwidth, Y1+APosY-MouseY,
+ X1+APosX-MouseX-halfwidth, Y1+APosY-MouseY, 0xffff);
}
}
@@ -211,6 +203,11 @@ Display( void )
{
float z = 0;
+ printf("(%f, %f) - (%f, %f), width = %f\n",
+ X0, Y0,
+ X1, Y1,
+ width);
+
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
@@ -238,9 +235,9 @@ Display( void )
glLineWidth(width);
glBegin(GL_LINES);
glColor3f(.8,0,0);
- glVertex3f(line.x0+x0offset, line.y0+y0offset, z);
+ glVertex3f(X0, Y0, z);
glColor3f(0,.9,0);
- glVertex3f(line.x1+x1offset, line.y1+y1offset, z);
+ glVertex3f(X1, Y1, z);
glEnd();
@@ -328,36 +325,34 @@ Key( unsigned char key, int x, int y)
{
switch (key) {
case 'w':
- y0offset += 1.0/(float)STEP;
+ Y0 += 1.0/(float)STEP;
break;
case 's':
- y0offset -= 1.0/(float)STEP;
+ Y0 -= 1.0/(float)STEP;
break;
case 'd':
- x0offset += 1.0/(float)STEP;
+ X0 += 1.0/(float)STEP;
break;
case 'a':
- x0offset -= 1.0/(float)STEP;
+ X0 -= 1.0/(float)STEP;
break;
case 'i':
- y1offset += 1.0/(float)STEP;
+ Y1 += 1.0/(float)STEP;
break;
case 'k':
- y1offset -= 1.0/(float)STEP;
+ Y1 -= 1.0/(float)STEP;
break;
case 'l':
- x1offset += 1.0/(float)STEP;
+ X1 += 1.0/(float)STEP;
break;
case 'j':
- x1offset -= 1.0/(float)STEP;
+ X1 -= 1.0/(float)STEP;
break;
case 'b':
width += 1.0/(float) STEP;
- printf("width = %f\n", width);
break;
case 'v':
width -= 1.0/(float) STEP;
- printf("width = %f\n", width);
break;
case 27:
exit(1);
@@ -373,20 +368,20 @@ SpecialKey( int k, int x, int y)
{
switch (k) {
case GLUT_KEY_UP:
- y0offset += 1.0/(float)STEP;
- y1offset += 1.0/(float)STEP;
+ Y0 += 1.0/(float)STEP;
+ Y1 += 1.0/(float)STEP;
break;
case GLUT_KEY_DOWN:
- y0offset -= 1.0/(float)STEP;
- y1offset -= 1.0/(float)STEP;
+ Y0 -= 1.0/(float)STEP;
+ Y1 -= 1.0/(float)STEP;
break;
case GLUT_KEY_RIGHT:
- x0offset += 1.0/(float)STEP;
- x1offset += 1.0/(float)STEP;
+ X0 += 1.0/(float)STEP;
+ X1 += 1.0/(float)STEP;
break;
case GLUT_KEY_LEFT:
- x0offset -= 1.0/(float)STEP;
- x1offset -= 1.0/(float)STEP;
+ X0 -= 1.0/(float)STEP;
+ X1 -= 1.0/(float)STEP;
break;
default:
return;
@@ -427,15 +422,11 @@ Init(void)
ImgWidth=128;
ImgHeight=128;
- x0offset = 0;
- y0offset = 0;
- x1offset = 0;
- y1offset = 0;
-
- line.x0 = 2;
- line.y0 = 2;
- line.x1 = 15;
- line.y1 = 15;
+ X0 = 2;
+ Y0 = 2;
+ X1 = 15;
+ Y1 = 15;
+
glutSetCursor(GLUT_CURSOR_CROSSHAIR);
glPixelStorei(GL_UNPACK_ROW_LENGTH, ImgWidth*ZOOM);
--
1.8.3.2
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