wisar:fast-2d-widget [CS Wiki]

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+WonderWidget.h
+<pre>
+#include <QGLWidget>
+class WonderWidget: public QGLWidget
+{
+	Q_OBJECT
+public:
+	WonderWidget(QWidget* parent, int sourcewidth, int sourceheight, int destwidth, int destheight):
+	QGLWidget(parent)
+	{
+		_sourcewidth = sourcewidth;
+		_sourceheight = sourceheight;
+		resize(destwidth, destheight);
+	}
+	void update(char* imgData);
+protected:
+     void initializeGL();
+     void paintGL();
+     void resizeGL(int width, int height);
+	GLuint textureID;
+	int _sourcewidth;
+	int _sourceheight;
+};
+</pre>
+WonderWidget.cpp
+<pre>
+#include "WonderWidget.h"
+void WonderWidget::update(char* imgData)
+{
+	if (imgData != 0)
+	{
+		glBindTexture(GL_TEXTURE_2D, textureID);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, _sourcewidth, _sourceheight, 0, GL_RGB, GL_UNSIGNED_BYTE, imgData);
+		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
+	}
+	updateGL();
+}
+void WonderWidget::initializeGL()
+{
+    glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE);
+    glEnable(GL_TEXTURE_2D);
+}
+void WonderWidget::paintGL()
+{
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glLoadIdentity();
+	glBindTexture(GL_TEXTURE_2D, textureID);
+	glBegin(GL_QUADS);
+		glTexCoord2d(0,1);
+		glVertex3d(0, 0, -1);
+		glTexCoord2d(1,1);
+		glVertex3d(1, 0, -1);
+		glTexCoord2d(1,0);
+		glVertex3d(1, 1, -1);
+		glTexCoord2d(0,0);
+		glVertex3d(0, 1, -1);
+	glEnd();
+}
+void WonderWidget::resizeGL(int width, int height)
+{
+     glViewport(0, 0, width, height);
+     glMatrixMode(GL_PROJECTION);
+     glLoadIdentity();
+     glOrtho(0, 1, 0, 1, 0.1, 2.0);
+     glMatrixMode(GL_MODELVIEW);
+}
+</pre>

wisar/fast-2d-widget.txt · Last modified: 2014/08/11 19:25 by tmburdge

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