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POzooming and scrolling texture of image using opengl in android
 

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  1. POzooming and scrolling texture of image using opengl in android
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    <p>i want to zoom a image in doubleTap, make it smoothly scrollable, please help me,my draw method is below:</p> <pre><code>public void draw(GL10 gl) { // bind the previously generated texture //zooming in image if(Globalconfig.flag==1 &amp;&amp; Globalconfig.flag2==true){ currentVertex=0; Globalconfig.b_height=texture.length; //Log.d("length",""+Globalconfig.b_height); gl.glViewport(0, 0, 444, 555); gl.glOrthof(0.0f, 444, 0.0f,555, -0.1f, 0.1f); for (int y = 0; y &lt; 10+ 1; y++) { for (int x = 0; x &lt;10 + 1; x++) { //vertices[currentVertex]=vertices[currentVertex]*1.5f; //vertices[currentVertex+1]=vertices[currentVertex+1]*1.5f; texture[currentVertex]/=1.5f; texture[currentVertex+1]/=1.5f; currentVertex +=2; } } Globalconfig.flag2=false; Log.d("instextureBufferide for", "nhjfghfx" ); //vertexBuffer.put(vertices); //vertexBuffer.position(0); textureBuffer.put(texture); textureBuffer.position(0); } //zooming out image //gl.glTranslatef(0,0 , 3); if(Globalconfig.flag==2 &amp;&amp; Globalconfig.flag2==true){ currentVertex=0; for (int y = 0; y &lt;10 + 1; y++) { for (int x = 0; x &lt;10 + 1; x++) { //vertices[currentVertex]=vertices[currentVertex]/3.5f; //vertices[currentVertex+1]=vertices[currentVertex+1]/3.5f; texture[currentVertex]*=1.5f; texture[currentVertex+1]*=1.5f; currentVertex +=2; } } transtaleT=false; Globalconfig.flag2=false; Log.d("inside for2", "nhjfghfx" ); //vertexBuffer.put(vertices); //vertexBuffer.position(0); textureBuffer.put(texture); textureBuffer.position(0); } if(Globalconfig.transFlag==true &amp;&amp; Globalconfig.flag==1 ){ currentVertex=0; for (int y = 0; y &lt; 10+ 1; y++) { for (int x = 0; x &lt;10 + 1; x++) { //vertices[currentVertex]=vertices[currentVertex]*3.5f; //vertices[currentVertex+1]=vertices[currentVertex+1]*3.5f; texture[currentVertex]+=Globalconfig.x/1000 ; texture[currentVertex+1]+=Globalconfig.y/1000; currentVertex +=2; Globalconfig.x1=(int)Globalconfig.x; Globalconfig.y1=(int)Globalconfig.y; } } vertexBuffer.put(vertices); vertexBuffer.position(0); Log.d("trans", "kjgvgv"); Globalconfig.transFlag=false; Log.d("trans1", "kjgvgv"); } //gl.glViewport(50, 50, 200, 200); gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]); // Point to our buffers gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); // Set the face rotation gl.glFrontFace(GL10.GL_CW); // Enable face culling. gl.glEnable(GL10.GL_CULL_FACE); // What faces to remove with the face culling. gl.glCullFace(GL10.GL_CONSTANT_ATTENUATION); // Point to our vertex buffer gl.glVertexPointer(2, GL10.GL_FLOAT, 0, vertexBuffer); gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT ); // Draw the vertices as triangle strip //gl.glTranslatef(0, 0, -4); //gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3); gl.glDrawElements(GL10.GL_TRIANGLES, numOfIndices, GL10.GL_UNSIGNED_SHORT, indicesBuffer); //Disable the client state before leaving gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); } </code></pre>
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